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< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义有符号 short 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " s1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hd< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // s1 = -100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义无符号 short 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " s2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hu< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // s2 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义 short 类型，默认是有符号< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 200< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " s3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hd< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // s3 = -200< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
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< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < / div > < / div > < ul > < li > 示例：获取类型占用的内存大小（存储空间）< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
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< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned short 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 2< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " signed short 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 2< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " short 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 2< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < / div > < / div > < ul > < li > 示例：获取类型的取值范围< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < limits.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned short 类型的范围是[0,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , USHRT_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [0,65535]< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " short 类型的范围是[< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hd< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hd< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , SHRT_MIN,SHRT_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [-32768,32767]< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < / div > < / div > < h3 id = "_1-2-3-整型" tabindex = "-1" > 1.2.3 整型 < a class = "header-anchor" href = "#_1-2-3-整型" aria-label = "Permalink to "1.2.3 整型"" > < / a > < / h3 > < ul > < li > 语法：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 无符号整型< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 有符号整型< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 有符号表示的是正数、负数和 0 ，即有正负号。无符号表示的是 0 和正数，即正整数，没有符号。< / li > < li > ② 在 < code > printf< / code > 中< code > 无符号整型（ ） < / code > 的< code > 格式占位符< / code > 是 < code > %u< / code > ， < code > 有符号整型（ ） < / code > 的< code > 格式占位符< / code > 是 < code > %d< / code > 。< / li > < li > ③ 可以通过 < code > sizeof< / code > 运算符获取< code > 无符号整型（ ） < / code > 和 < code > 有符号整型（ ） < / code > 的< code > 存储空间（所占内存空间）< / code > 。< / li > < li > ③ 可以通过 < code > #include < limits.h> < / code > 来获取 < code > 无符号整型（ ） < / code > 和< code > 有符号整型（ ） < / code > 的< code > 取值范围< / code > 。< / li > < / ul > < / div > < ul > < li > 示例：定义和打印整型变量< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义有符号 int 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i1 = -100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义无符号 int 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %u< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i2 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义 int 类型，默认是有符号< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 200< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i3 = -200< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < / div > < / div > < ul > < li > 示例：获取类型占用的内存大小（存储空间）< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned int 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " signed int 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " int 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < / div > < / div > < ul > < li > 示例：获取类型的取值范围< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < limits.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned int 类型的范围是[0,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %u< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , UINT_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [0,4294967295]< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " int 类型的范围是[< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , INT_MIN,INT_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [-2147483648,2147483647]< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < / div > < / div > < h3 id = "_1-2-4-长整型-了解" tabindex = "-1" > 1.2.4 长整型（了解） < a class = "header-anchor" href = "#_1-2-4-长整型-了解" aria-label = "Permalink to "1.2.4 长整型（了解）"" > < / a > < / h3 > < ul > < li > 语法：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 无符号长整型< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 有符号长整型< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 有符号表示的是正数、负数和 0 ，即有正负号。无符号表示的是 0 和正数，即正整数，没有符号。< / li > < li > ② 在 < code > printf< / code > 中< code > 无符号长整型（ ） < / code > 的< code > 格式占位符< / code > 是 < code > %lu< / code > ， < code > 有符号长整型（ ） < / code > 的< code > 格式占位符< / code > 是 < code > %ld< / code > 。< / li > < li > ③ 可以通过 < code > sizeof< / code > 运算符获取< code > 无符号长整型（ ） < / code > 和 < code > 有符号长整型（ ） < / code > 的< code > 存储空间（所占内存空间）< / code > 。< / li > < li > ③ 可以通过 < code > #include < limits.h> < / code > 来获取 < code > 无符号长整型（ ） < / code > 和< code > 有符号长整型（ ） < / code > 的< code > 取值范围< / code > 。< / li > < / ul > < / div > < ul > < li > 示例：定义和打印长整型变量< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义有符号 long 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > l1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " l1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %ld< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , l1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // l1 = -100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义无符号 long 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > l2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " l2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lu< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , l2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // l2 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义 long 类型，默认是有符号< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > l3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 200< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " l3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %ld< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , l3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // l3 = -200< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < / div > < / div > < ul > < li > 示例：获取类型占用的内存大小（存储空间）< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > l1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned long 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , l1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > l2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " signed long 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , l2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > l3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " long 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , l3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < / div > < / div > < ul > < li > 示例：获取类型的取值范围< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < limits.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned long 类型的范围是[0,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ULONG_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [0,4294967295]< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " long 类型的范围是[< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %ld< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %ld< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , LONG_MIN,LONG_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [-2147483648,2147483647]< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < / div > < / div > < h3 id = "_1-2-5-长长整型-了解" tabindex = "-1" > 1.2.5 长长整型（了解） < a class = "header-anchor" href = "#_1-2-5-长长整型-了解" aria-label = "Permalink to "1.2.5 长长整型（了解）"" > < / a > < / h3 > < ul > < li > 语法：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 无符号长长整型< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 有符号长长整型< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 有符号表示的是正数、负数和 0 ，即有正负号。无符号表示的是 0 和正数，即正整数，没有符号。< / li > < li > ② 在 < code > printf< / code > 中< code > 无符号长长整型（ ） < / code > 的< code > 格式占位符< / code > 是 < code > %llu< / code > ， < code > 有符号长长整型（ ） < / code > 的< code > 格式占位符< / code > 是 < code > %lld< / code > 。< / li > < li > ③ 可以通过 < code > sizeof< / code > 运算符获取< code > 无符号长长整型（ ） < / code > 和 < code > 有符号长长整型（ ） < / code > 的< code > 存储空间（所占内存空间）< / code > 。< / li > < li > ③ 可以通过 < code > #include < limits.h> < / code > 来获取 < code > 无符号长长整型（ ） < / code > 和< code > 有符号长长整型（ ） < / code > 的< code > 取值范围< / code > 。< / li > < / ul > < / div > < ul > < li > 示例：定义和打印长长整型变量< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义有符号 long long 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ll1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " ll1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lld< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ll1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // ll1 = -100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义无符号 long long 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ll2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " ll2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %llu< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ll2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // ll2 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 定义 long long 类型，默认是有符号< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ll3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 200< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " ll3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lld< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ll3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // ll3 = -200< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < / div > < / div > < ul > < li > 示例：获取类型占用的内存大小（存储空间）< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ll1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned long long 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ll1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 8< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ll2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " signed long long 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ll2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 8< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ll3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " long long 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ll3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 8< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < / div > < / div > < ul > < li > 示例：获取类型的取值范围< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < limits.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned long long 类型的范围是[0,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %llu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ULLONG_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [0,18446744073709551615]< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " long long 类型的范围是[< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lld< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lld< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , LLONG_MIN,LLONG_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [-9223372036854775808,9223372036854775807]< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < / div > < / div > < h3 id = "_1-2-6-字面量后缀" tabindex = "-1" > 1.2.6 字面量后缀 < a class = "header-anchor" href = "#_1-2-6-字面量后缀" aria-label = "Permalink to "1.2.6 字面量后缀"" > < / a > < / h3 > < ul > < li > < code > 字面量< / code > 是< code > 源代码< / code > 中一个< code > 固定值< / code > 的< code > 表示方法< / code > ，用于直接表示数据，即：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 100 就是字面量< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > L< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 100L 就是字面量< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > LL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 100LL 就是字面量< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 默认情况下的，整数字面量的类型是 int 类型。< / li > < li > ② 如果需要表示 long 类型的字面量，需要添加后缀 l 或 L ，建议 L。< / li > < li > ③ 如果需要表示 long long类型的字面量， ， < / li > < li > ④ 如果需要表示无符号整数类型的字面量，需要添加 u 或 U， < / li > < / ul > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > <
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // num = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > L< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %ld\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // num2 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > LL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lld\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // num3 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num4 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > U< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num4 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %u\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num4);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // num4 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num5 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > LU< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num5 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lu\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num5);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // num5 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num6 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ULL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num6 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %llu\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num6);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // num6 = 100< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < / div > < / div > < h3 id = "_1-2-7-精确宽度类型" tabindex = "-1" > 1.2.7 精确宽度类型 < a class = "header-anchor" href = "#_1-2-7-精确宽度类型" aria-label = "Permalink to "1.2.7 精确宽度类型"" > < / a > < / h3 > < ul > < li > 在前文，我们了解到 C 语言的整数类型（ ） ， ， ， （ ） ， ： （ ） ， < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > Java 语言中的数据类型的存储空间（字节宽度）是一致的，这也是 Java 语言能够跨平台的原因之一（最主要的原因还是 JVM） < / li > < li > 在嵌入式开发中，使用精确宽度类型可以确保代码在各个平台上的一致性。< / li > < / ul > < / div > < ul > < li > 在 C 语言的标准头文件 < code > < stdint.h> < / code > 中定义了一些新的类型别名，如下所示：< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > 类型名称< / th > < th > 含义< / th > < / tr > < / thead > < tbody > < tr > < td > int8_t< / td > < td > 8 位有符号整数< / td > < / tr > < tr > < td > int16_t< / td > < td > 16 位有符号整数< / td > < / tr > < tr > < td > int32_t< / td > < td > 32 位有符号整数< / td > < / tr > < tr > < td > int64_t< / td > < td > 64 位有符号整数< / td > < / tr > < tr > < td > uint8_t< / td > < td > 8 位无符号整数< / td > < / tr > < tr > < td > uint16_t< / td > < td > 16 位无符号整数< / td > < / tr > < tr > < td > uint32_t< / td > < td > 32 位无符号整数< / td > < / tr > < tr > < td > uint64_t< / td > < td > 64 位无符号整数< / td > < / tr > < / tbody > < / table > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 上面的这些类型都是类型别名，编译器会指定它们指向的底层类型，如：在某个系统中，如果 int 类型是 32 位，那么 int32_t 就会指向 int ；如果 long 类型是 32 位，那么 int32_t 就会指向 long。< / p > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdint.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 变量 x32 声明为 int32_t 类型，可以保证是 32 位(4个字节)的宽度。< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int32_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x32 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 45933945< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " x32 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , x32);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // x32 = 45933945< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-17 08:15:03 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < / div > < / div > < h3 id = "_1-2-8-sizeof-运算符" tabindex = "-1" > 1.2.8 sizeof 运算符 < a class = "header-anchor" href = "#_1-2-8-sizeof-运算符" aria-label = "Permalink to "1.2.8 sizeof 运算符"" > < / a > < / h3 > < ul > < li > 语法：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (表达式)< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > < p > ① sizeof 是运算符，不是内置函数。< / p > < / li > < li > < p > ② 表达式可以是任何类型的数据类型、变量或常量。< / p > < / li > < li > < p > ③ 用来获取某种数据类型、变量或常量占用的字节数量（内存中的存储单元），并且 < code > sizeof(...)< / code > 的< code > 返回值类型< / code > 是 < code > size_t< / code > ；并且，如果是变量名称，可以省略 < code > ()< / code > ；如果是数据类型，则不能省略 < code > ()< / code > 。< / p > < / li > < li > < p > ④ 在 < code > printf< / code > 中使用占位符 < code > %zu< / code > 来处理 < code > size_t< / code > 类型的值。< / p > < / li > < li > < p > ⑤ 之前， ， ， ， < / p > < / li > < li > < p > ⑥ 与 C 语言不同， < code > int< / code > 类型在所有平台上都是 4 个字节，无论是在 Linux、MacOS 还是 Windows 上。因此，这些语言不需要像 C 语言那样依赖 < code > sizeof< / code > 来处理不同平台上的数据类型大小差异，因为编译器已经在底层处理了这些差异。换言之，< code > sizeof< / code > 运算符在 C 语言中的重要性在于它为程序员提供了一个处理不同平台上数据类型大小差异的工具。当然，如果你在 C 语言中，使用精确宽度类型，如：< code > int8_t< / code > 、< code > int16_t< / code > 、< code > int32_t< / code > 、< code > uint8_t< / code > 、 < code > uint16_t< / code > 、< code > uint32_t< / code > 等，也可以确保代码在各个平台上的一致性。< / p > < / li > < / ul > < / div > < ul > < li > 示例：参数是数据类型< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-17 11:22:32 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stddef.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < / div > < / div > < ul > < li > 示例：参数是变量< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stddef.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (num);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < / div > < / div > < ul > < li > 示例：参数是常量< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stddef.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > size_t< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-26 03:39:51 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < / div > < / div > < h2 id = "_1-3-数值溢出" tabindex = "-1" > 1.3 数值溢出 < a class = "header-anchor" href = "#_1-3-数值溢出" aria-label = "Permalink to "1.3 数值溢出"" > < / a > < / h2 > < h3 id = "_1-3-1-概述" tabindex = "-1" > 1.3.1 概述 < a class = "header-anchor" href = "#_1-3-1-概述" aria-label = "Permalink to "1.3.1 概述"" > < / a > < / h3 > < ul > < li > 在生活中，如果一个容器的容量是固定的，我们不停的向其中注入水，那么当容器中充满水之后，继续注入，就会溢出，如下所示：< / li > < / ul > < p > < img src = "/c/assets/3.D7eNbwzQ.jpg" alt = "" loading = "lazy" > < / p > < ul > < li > 在程序中也是一样的， ， ： ， < code > 溢出< / code > （ ） < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > 如果这个数目前是< code > 最大值< / code > ，再进行< code > 加法< / code > 计算，数据就会超过该类型能够表示的最大值，叫做< code > 上溢出< / code > （如果最大值 + 1 会“绕回”到最小值）。< / li > < li > 如果这个数目前是< code > 最小值< / code > ，再进行< code > 减法< / code > 计算，数据就会超过该类型能够表示的最小值， 叫做< code > 下溢出< / code > （如果最小值 - 1 会“绕回”到最大值）。< / li > < / ul > < p > 在 C 语言中，程序产生数值溢出的时候，并不会引起错误而自动停止，是因为计算机直接按照二进制补码的运算规则进行处理；但是，这可能会导致不可预料的后果。因此，编程时要特别注意避免数值溢出，特别是在涉及大数或小数的运算时。< / p > < / div > < h3 id = "_1-3-2-无符号数的取值范围" tabindex = "-1" > 1.3.2 无符号数的取值范围 < a class = "header-anchor" href = "#_1-3-2-无符号数的取值范围" aria-label = "Permalink to "1.3.2 无符号数的取值范围"" > < / a > < / h3 > < ul > < li > 在 C 语言中，< code > 无符号数< / code > （ < code > 0< / code > 就是< code > 最小值< / code > ，设置为 < code > 1< / code > 就是< code > 最大值< / code > 。< / li > < / ul > < div class = "important custom-block github-alert" > < p class = "custom-block-title" > IMPORTANT< / p > < p > < / p > < p > 在 C 语言中，无符号整数，最高位不是符号位，它是数值的一部分。< / p > < / div > < ul > < li > 以 < code > unsigned char< / code > 类型为例，它在内存中占用的存储单元是 1 个字节，即 8 位。如果所有位都设置为 < code > 0< / code > ，它的最小值就是 < code > 0< / code > ；如果所有位设置为 < code > 1< / code > ，它的最大值就是 < code > 2⁸ - 1 = 255< / code > ，如下所示：< / li > < / ul > < p > < img src = "/c/assets/4.DElD8M7P.svg" alt = "" loading = "lazy" > < / p > < ul > < li > 那么，< code > unsigned char< / code > 的最大值是如何计算出来的？最简单的方法就是这样的，如下所示：< / li > < / ul > < div class = "language-txt vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > txt< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span > 1 × <>
2024-08-23 10:13:42 +02:00
< span class = "line" > < span > = 1 + 2 + 4 + 8 + 16 + 32 + 64 + 128 < / span > < / span >
< span class = "line" > < span > = 255< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < / div > < / div > < ul > < li > 但是，这种计算方法虽然有效，但是非常麻烦，如果是 8 个字节的 long ，那么计算就非常麻烦了（可能要计算半天）。当然，我们也知道，这就是等比数列（高中知识），等比数列的公式，如下所示：< / li > < / ul > < p > < mjx-container class = "MathJax" jax = "SVG" style = "direction:ltr;position:relative;" > < svg style = "overflow:visible;min-height:1px;min-width:1px;vertical-align:-0.912ex;" xmlns = "http://www.w3.org/2000/svg" width = "15.075ex" height = "2.893ex" role = "img" focusable = "false" viewBox = "0 -875.7 6663.1 1278.6" aria-hidden = "true" > < g stroke = "currentColor" fill = "currentColor" stroke-width = "0" transform = "scale(1,-1)" > < g data-mml-node = "math" > < g data-mml-node = "msub" > < g data-mml-node = "mi" > < path data-c = "1D446" d = "M308 24Q367 24 416 76T466 197Q466 260 414 284Q308 311 278 321T236 341Q176 383 176 462Q176 523 208 573T273 648Q302 673 343 688T407 704H418H425Q521 704 564 640Q565 640 577 653T603 682T623 704Q624 704 627 704T632 705Q645 705 645 698T617 577T585 459T569 456Q549 456 549 465Q549 471 550 475Q550 478 551 494T553 520Q553 554 544 579T526 616T501 641Q465 662 419 662Q362 662 313 616T263 510Q263 480 278 458T319 427Q323 425 389 408T456 390Q490 379 522 342T554 242Q554 216 546 186Q541 164 528 137T492 78T426 18T332 -20Q320 -22 298 -22Q199 -22 144 33L134 44L106 13Q83 -14 78 -18T65 -22Q52 -22 52 -14Q52 -11 110 221Q112 227 130 227H143Q149 221 149 216Q149 214 148 207T144 186T142 153Q144 114 160 87T203 47T255 29T308 24Z" style = "stroke-width:3;" > < / path > < / g > < g data-mml-node = "mi" transform = "translate(646,-150) scale(0.707)" > < path data-c = "1D45B" d = "M21 287Q22 293 24 303T36 341T56 388T89 425T135 442Q171 442 195 424T225 390T231 369Q231 367 232 367L243 378Q304 442 382 442Q436 442 469 415T503 336T465 179T427 52Q427 26 444 26Q450 26 453 27Q482 32 505 65T540 145Q542 153 560 153Q580 153 580 145Q580 144 576 130Q568 101 554 73T508 17T439 -10Q392 -10 371 17T350 73Q350 92 386 193T423 345Q423 404 379 404H374Q288 404 229 303L222 291L189 157Q156 26 151 16Q138 -11 108 -11Q95 -11 87 -5T76 7T74 17Q74 30 112 180T152 343Q153 348 153 366Q153 405 129 405Q91 405 66 305Q60 285 60 284Q58 278 41 278H27Q21 284 21 287Z" style = "stroke-width:3;" > < / path > < / g > < / g > < g data-mml-node = "mo" transform = "translate(1398,0)" > < path data-c = "3D" d = "M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z" style = "stroke-width:3;" > < / path > < / g > < g data-mml-node = "msub" transform = "translate(2453.8,0)" > < g data-mml-node = "mi" > < path data-c = "1D44E" d = "M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z" style = "stroke-width:3;" > < / path > < / g > < g data-mml-node = "mn" transform = "translate(562,-150) scale(0.707)" > < path data-c = "31" d = "M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z" style = "stroke-width:3;" > < / path > < / g > < / g > < g data-mml-node = "mo" transform = "translate(3641.6,0)" > < path data-c = "D7" d = "M630 29Q630 9 609 9Q604 9 587 25T493 118L389 222L284 117Q178 13 175 11Q171 9 168 9Q160 9 154 15T147 29Q147 36 161 51T255 146L359 250L255 354Q174 435 161 449T147 471Q147 480 153 485T168 490Q173 490 175 489Q178 487 284 383L389 278L493 382Q570 459 587
< span class = "line" > < span > = 10000 0000 - 1< / span > < / span >
< span class = "line" > < span > = 2⁹⁻¹ - 1< / span > < / span >
< span class = "line" > < span > = 2⁸ - 1 < / span > < / span >
< span class = "line" > < span > = 255< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < / div > < / div > < ul > < li > 其对应的换算过程，如下所示：< / li > < / ul > < p > < img src = "/c/assets/5.BE2mwvAQ.svg" alt = "" loading = "lazy" > < / p > < div class = "important custom-block github-alert" > < p class = "custom-block-title" > IMPORTANT< / p > < p > < / p > < ul > < li > ① 当内存中所有的位都是 1 的时候，这种“凑整”的技巧非常实用！！！< / li > < li > ② 按照上述的技巧，我们可以很容易得计算出： < ul > < li > < code > unsinged char< / code > （ < code > [0, 2⁸ - 1]< / code > 。< / li > < li > < code > unsinged short< / code > （ < code > [0, 2¹⁶ - 1]< / code > 。< / li > < li > < code > unsinged int< / code > （ < code > [0, 2³² - 1]< / code > 。< / li > < li > < code > unsinged long< / code > （ < code > [0, 2⁶⁴ - 1]< / code > 。< / li > < / ul > < / li > < / ul > < / div > < h3 id = "_1-3-3-有符号数的取值范围" tabindex = "-1" > 1.3.3 有符号数的取值范围 < a class = "header-anchor" href = "#_1-3-3-有符号数的取值范围" aria-label = "Permalink to "1.3.3 有符号数的取值范围"" > < / a > < / h3 > < ul > < li > 在 C 语言中，< code > 有符号数< / code > （ < code > 补码< / code > 的形式存储的（计算的时候，也是以补码的形式进行计算的，并且符号位参与计算）；但是，在读取的时候，需要采用< code > 逆向< / code > 的转换，即：将补码转换为原码。< / li > < / ul > < div class = "important custom-block github-alert" > < p class = "custom-block-title" > IMPORTANT< / p > < p > < / p > < p > 在 C 语言中，有符号整数，最高位是符号位，用于表示正负数。< / p > < / div > < ul > < li > 以 < code > char< / code > 类型为例，它的取值范围，如下所示：< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > 补码< / th > < th > 反码< / th > < th > 原码< / th > < th > 值< / th > < / tr > < / thead > < tbody > < tr > < td > 1111 1111< / td > < td > 1111 1110< / td > < td > 1000 0001< / td > < td > -1< / td > < / tr > < tr > < td > 1111 1110< / td > < td > 1111 1101< / td > < td > 1000 0010< / td > < td > -2< / td > < / tr > < tr > < td > 1111 1101< / td > < td > 1111 1100< / td > < td > 1000 0011< / td > < td > -3< / td > < / tr > < tr > < td > ...< / td > < td > ...< / td > < td > ...< / td > < td > ...< / td > < / tr > < tr > < td > 1000 0011< / td > < td > 1000 0010< / td > < td > 1111 1101< / td > < td > -125< / td > < / tr > < tr > < td > 1000 0010< / td > < td > 1000 0001< / td > < td > 1111 1110< / td > < td > -126< / td > < / tr > < tr > < td > 1000 0001< / td > < td > 1000 0000< / td > < td > 1111 1111< / td > < td > -127< / td > < / tr > < tr > < td > < strong > 1000 0000< / strong > < / td > < td > < strong > ---< / strong > < / td > < td > < strong > ---< / strong > < / td > < td > < strong > -128< / strong > < / td > < / tr > < tr > < td > 0111 1111< / td > < td > 0111 1111< / td > < td > 0111 1111< / td > < td > 127< / td > < / tr > < tr > < td > 0111 1110< / td > < td > 0111 1110< / td > < td > 0111 1110< / td > < td > 126< / td > < / tr > < tr > < td > 0111 1101< / td > < td > 0111 1101< / td > < td > 0111 1101< / td > < td > 125< / td > < / tr > < tr > < td > ...< / td > < td > ...< / td > < td > ...< / td > < td > ...< / td > < / tr > < tr > < td > 0000 0010< / td > < td > 0000 0010< / td > < td > 0000 0010< / td > < td > 2< / td > < / tr > < tr > < td > 0000 0001< / td > < td > 0000 0001< / td > < td > 0000 0001< / td > < td > 1< / td > < / tr > < tr > < td > 0000 0000< / td > < td > 0000 0000< / td > < td > 0000 0000< / td > < td > 0< / td > < / tr > < / tbody > < / table > < ul > < li > 从上面的列表中，我们可以得知，< code > char< / code > 类型的取值范围是：< code > [-2⁸, 2⁸ - 1]< / code > ，即：< code > [-128, 127]< / code > 。< / li > < li > 对于 < code > -128< / code > 而言，它的补码是 < code > 1000 0000< / code > ，是无法按照传统的补码表示法来计算原码的，因为在补码转换到反码的时候需要 < code > -1< / code > ，而 < code > 1000 0000 - 1< / code > 需要向高位借 < code > 1< / code > ，而最高位是符号位是不能借的，这就非常矛盾。< / li > < / ul > < div class = "important custom-block github-alert" > < p class = "custom-block-title" > IMPORTANT< / p > < p > < / p > < p > 计算机规定，< code > 1000 0000< / code > 这个特殊的补码就表示 < code > -128< / code > 。< / p > < / div > < ul > < li > 但是，为什么偏偏是 < code > -128< / code > ，而不是其它数字？是
2024-07-17 11:22:32 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > USHRT_MAX < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 无符号的上溢出 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hu< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 0< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 无符号的下溢出 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hu< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 65535< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < / div > < / div > < ul > < li > 示例：有符号的上溢出和下溢出< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < limits.h> < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > SHRT_MAX < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 有符号的上溢出 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hd< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // -32768< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > SHRT_MIN < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 有符号的下溢出 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %hd< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , s2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 32767< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < / div > < / div > < h2 id = "_1-4-浮点类型" tabindex = "-1" > 1.4 浮点类型 < a class = "header-anchor" href = "#_1-4-浮点类型" aria-label = "Permalink to "1.4 浮点类型"" > < / a > < / h2 > < h3 id = "_1-4-1-概述" tabindex = "-1" > 1.4.1 概述 < a class = "header-anchor" href = "#_1-4-1-概述" aria-label = "Permalink to "1.4.1 概述"" > < / a > < / h3 > < ul > < li > 在生活中，我们除了使用< code > 整数< / code > ， ： < code > 小数< / code > ， ： < code > 小数< / code > 在计算机中也被称为< code > 浮点数< / code > （和底层存储有关）。< / li > < li > < code > 整数< / code > 在计算机底层的存储被称为< code > 定点存储< / code > ，如下所示：< / li > < / ul > < p > < img src = "/c/assets/10.Dx5GM3xz.svg" alt = "" loading = "lazy" > < / p > < ul > < li > < code > 小数< / code > 在计算机底层的存储被称为< code > 浮点存储< / code > ，如下所示：< / li > < / ul > < p > < img src = "/c/assets/11.DNH2vSdC.svg" alt = "" loading = "lazy" > < / p > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 计算机底层就是采取类似科学计数法的形式来存储小数的， ， ： ； ， < / li > < li > ② 因为尾数区的内存空间的宽度不同，导致了小数的精度也不相同，所以小数在计算机中也称为浮点数。< / li > < / ul > < / div > < ul > < li > 在 C 语言中，变量的浮点类型，如下所示：< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > 类型< / th > < th > 存储大小< / th > < th > 值的范围< / th > < th > 有效小数位数< / th > < / tr > < / thead > < tbody > < tr > < td > float（ ） < / td > < td > 4 字节< / td > < td > 1.2E-38 ~ 3.4E+38< / td > < td > 6 ~ 9< / td > < / tr > < tr > < td > double（ ） < / td > < td > 8 字节< / td > < td > 2.3E-308 ~ 1.7E+308< / td > < td > 15 ~ 18< / td > < / tr > < tr > < td > long double（ ） < / td > < td > 16 字节< / td > < td > 3.4E-4932 ~ 1.2E+4932< / td > < td > 18 或更多< / td > < / tr > < / tbody > < / table > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 各类型的存储大小和精度受到操作系统、编译器、硬件平台的影响。< / li > < li > ② 浮点型数据有两种表现形式： < ul > < li > 十进制数形式： （ ） < / li > < li > 科学计数法形式： （ ） （ ） < / li > < / ul > < / li > < li > ③ 在实际开发中，对于浮点类型，建议使用 double 类型；如果范围不够，就使用 long double 类型。< / li > < / ul > < / div > < h3 id = "_1-4-2-格式占位符" tabindex = "-1" > 1.4.2 格式占位符 < a class = "header-anchor" href = "#_1-4-2-格式占位符" aria-label = "Permalink to "1.4.2 格式占位符"" > < / a > < / h3 > < ul > < li > < p > 对于 float 类型的格式占位符，是 < code > %f< / code > ，默认会保留 < code > 6< / code > 位小数；可以指定小数位，如：< code > %.2f< / code > 表示保留 < code > 2< / code > 位小数。< / p > < / li > < li > < p > 对于 double 类型的格式占位符，是 < code > %lf< / code > ，默认会保留 < code > 6< / code > 位小数；可以指定小数位，如：< code > %.2lf< / code > 表示保留 < code > 2< / code > 位小数。< / p > < / li > < li > < p > 对于 long double 类型的格式占位符，是 < code > %Lf< / code > ，默认会保留 < code > 6< / code > 位小数；可以指定小数位，如：< code > %.2Lf< / code > 表示保留 < code > 2< / code > 位小数。< / p > < / li > < li > < p > 如果想输出< code > 科学计数法< /c
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > float< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > f1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10.0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " f1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %f< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , f1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // f1 = 10.000000< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " f1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2f< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , f1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // f1 = 10.00< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 13.14159265354< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lf< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d1 = 13.141593< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2lf< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d1 = 13.14< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 13.14159265354< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %LF< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d1 = 13.141593< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2LF< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d1 = 13.14< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > float< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > f1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3.1415926< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3.14< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > e< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 2< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " f1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2f< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , f1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // f1 = 3.14< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " f1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2e< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , f1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // f1 = 3.14e+00< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2lf< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d2 = 314.00< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2e< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d2 = 3.14e+02< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < / div > < / div > < h3 id = "_1-4-3-字面量后缀" tabindex = "-1" > 1.4.3 字面量后缀 < a class = "header-anchor" href = "#_1-4-3-字面量后缀" aria-label = "Permalink to "1.4.3 字面量后缀"" > < / a > < / h3 > < ul > < li > < p > 浮点数字面量默认是 double 类型。< / p > < / li > < li > < p > 如果需要表示 float 类型的字面量，需要后面添加后缀 f 或 F。< / p > < / li > < li > < p > 如果需要表示 long double 类型的字面量，需要后面添加后缀 l 或 L。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > float< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > f1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3.1415926< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > f< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3.1415926< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3.1415926< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > L< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " f1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2f< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , f1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // f1 = 3.14< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.3lf< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d2 = 3.142< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.4Lf< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d3 = 3.1416< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < / div > < / div > < h3 id = "_1-4-4-类型占用的内存大小-存储空间" tabindex = "-1" > 1.4.4 类型占用的内存大小（存储空间） < a class = "header-anchor" href = "#_1-4-4-类型占用的内存大小-存储空间" aria-label = "Permalink to "1.4.4 类型占用的内存大小（存储空间）"" > < / a > < / h3 > < ul > < li > < p > 可以通过 sizeof 运算符来获取 float、double 以及 long double 类型占用的内存大小（存储空间）。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " float 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > float< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ));< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 4< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " double 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ));< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 8< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " long double 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %zu< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > long< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ));< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 16< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < / div > < / div > < h3 id = "_1-4-5-类型的取值范围" tabindex = "-1" > 1.4.5 类型的取值范围 < a class = "header-anchor" href = "#_1-4-5-类型的取值范围" aria-label = "Permalink to "1.4.5 类型的取值范围"" > < / a > < / h3 > < ul > < li > < p > 可以通过 < code > #include < float.h> < / code > 来获取类型的取值范围。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < float.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " float 的取值范围是：[< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.38f< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %f< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ] < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , FLT_MIN, FLT_MAX);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " double 的取值范围是：[< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lf< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %lf< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ] < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , DBL_MIN, DBL_MAX);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " double 的取值范围是：[< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %Lf< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %Lf< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ] < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , LDBL_MIN, LDBL_MAX);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < / div > < / div > < h2 id = "_1-5-字符类型" tabindex = "-1" > 1.5 字符类型 < a class = "header-anchor" href = "#_1-5-字符类型" aria-label = "Permalink to "1.5 字符类型"" > < / a > < / h2 > < h3 id = "_1-5-1-概述" tabindex = "-1" > 1.5.1 概述 < a class = "header-anchor" href = "#_1-5-1-概述" aria-label = "Permalink to "1.5.1 概述"" > < / a > < / h3 > < ul > < li > 在生活中，我们会经常说：今天天气真 < code > 好< / code > ，我的性别是 < code > 女< / code > ，我今年 < code > 10< / code > 岁，像这类数据，在 C 语言中就可以用字符（ ） < / li > < li > 在 C 语言中，变量的< code > 字符类型< / code > 可以表示< code > 单< / code > 个字符，如：< code > ' 1' < / code > 、< code > ' A' < / code > 、< code > ' & ' < / code > 。< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① C 语言的出现在 1972 年，由美国人丹尼斯·里奇设计出来；那个时候，只需要 1 个字节的内存空间， （ ） ， ： ； ， < / li > < li > ② 像拉丁体系（ ） ， ： < / li > < li > ③ C 语言中没有字符串类型， （ < / li > < li > ④ 在 C 语言中， ， （ < / li > < li > ⑤ 在 C++、Java 等高级编程语言中，已经提供了 String （字符串）类型，原生支持 Unicode， < / li > < / ul > < / div > < ul > < li > 在 C 语言中，可以使用< code > 转义字符 \< / code > 来表示特殊含义的字符。< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > < strong > 转义字符< / strong > < / th > < th > < strong > 说明< / strong > < / th > < / tr > < / thead > < tbody > < tr > < td > < code > \b< / code > < / td > < td > 退格< / td > < / tr > < tr > < td > < code > \n< / code > < / td > < td > 换行符< / td > < / tr > < tr > < td > < code > \r< / code > < / td > < td > 回车符< / td > < / tr > < tr > < td > < code > \t< / code > < / td > < td > 制表符< / td > < / tr > < tr > < td > < code > \" < / code > < / td > < td > 双引号< / td > < / tr > < tr > < td > < code > \' < / code > < / td > < td > 单引号< / td > < / tr > < tr > < td > < code > \\< / code > < / td > < td > 反斜杠< / td > < / tr > < tr > < td > ...< / td > < td > < / td > < / tr > < / tbody > < / table > < h3 id = "_1-5-2-格式占位符" tabindex = "-1" > 1.5.2 格式占位符 < a class = "header-anchor" href = "#_1-5-2-格式占位符" aria-label = "Permalink to "1.5.2 格式占位符"" > < / a > < / h3 > < ul > < li > < p > 在 C 语言中，使用 < code > %c< / code > 来表示 char 类型。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > c < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' & ' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " c = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , c);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // c = & < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > c2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' a' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " c2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , c2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // c2 = a< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > c3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' A' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " c3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , c3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // c3 = A< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < / div > < / div > < h3 id = "_1-5-3-类型占用的内存大小-存储空间" tabindex = "-1" > 1.5.3 类型占用的内存大小（存储空间） < a class = "header-anchor" href = "#_1-5-3-类型占用的内存大小-存储空间" aria-label = "Permalink to "1.5.3 类型占用的内存大小（存储空间）"" > < / a > < / h3 > < ul > < li > < p > 可以通过 sizeof 运算符来获取 char 类型占用的内存大小（存储空间）。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " char 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ));< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 1 < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned char 的存储空间是 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 字节< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ));< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 1< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < / div > < / div > < h3 id = "_1-5-4-类型的取值范围" tabindex = "-1" > 1.5.4 类型的取值范围 < a class = "header-anchor" href = "#_1-5-4-类型的取值范围" aria-label = "Permalink to "1.5.4 类型的取值范围"" > < / a > < / h3 > < ul > < li > < p > 可以通过 < code > #include < limits.h> < / code > 来获取类型的取值范围。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < limits.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " char 范围是[< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ] < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , CHAR_MIN,CHAR_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [-128,127]< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " unsigned char 范围是[0,< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ]< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , UCHAR_MAX);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // [0,255]< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < / div > < / div > < h3 id = "_1-5-5-字符类型的本质" tabindex = "-1" > 1.5.5 字符类型的本质 < a class = "header-anchor" href = "#_1-5-5-字符类型的本质" aria-label = "Permalink to "1.5.5 字符类型的本质"" > < / a > < / h3 > < ul > < li > 在 C 语言中， < / li > < / ul > < p > < img src = "/c/assets/12.NlBmD7pA.png" alt = "" loading = "lazy" > < / p > < ul > < li > char 类型同样分为 signed char（ ） （ ） ， ， ， < / li > < li > < code > 字符类型的数据< / code > 在计算机中< code > 存储< / code > 和< code > 读取< / code > 的过程，如下所示：< / li > < / ul > < p > < img src = "/c/assets/13.ZiBq6Pno.png" alt = "" loading = "lazy" > < / p > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < limits.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // char 类型字面量需要使用单引号包裹< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' A' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' 9' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \t< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " c1=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , c3=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , c2=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a1, a3, a2);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // char 类型本质上整数可以进行运算< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' b' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 101< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > -> < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , b1, b1);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > -> < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , b2, b2);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > +< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %c< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , b1, b2, b1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b2);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // char 类型取值范围< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > c1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 200< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 无符号 char 取值范围 0 ~255< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > signed< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > c2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 200< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 有符号 char 取值范围 -128~127， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > c3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 200< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 当前系统， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " c1=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , c2=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , c3=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , c1, c2, c3);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < / div > < / div > < h2 id = "_1-6-布尔类型" tabindex = "-1" > 1.6 布尔类型 < a class = "header-anchor" href = "#_1-6-布尔类型" aria-label = "Permalink to "1.6 布尔类型"" > < / a > < / h2 > < h3 id = "_1-6-1-概述" tabindex = "-1" > 1.6.1 概述 < a class = "header-anchor" href = "#_1-6-1-概述" aria-label = "Permalink to "1.6.1 概述"" > < / a > < / h3 > < ul > < li > 布尔值用于表示 true（ ） （ ） ， < / li > < / ul > < h3 id = "_1-6-2-早期的布尔类型" tabindex = "-1" > 1.6.2 早期的布尔类型 < a class = "header-anchor" href = "#_1-6-2-早期的布尔类型" aria-label = "Permalink to "1.6.2 早期的布尔类型"" > < / a > < / h3 > < ul > < li > < p > 在 C 语言标准（ ） ， ， ， < code > 0< / code > 表示 < code > false< / code > （假），< code > 非 0< / code > 表示 < code > true< / code > （真）。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
2024-08-17 08:49:53 +02:00
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 禁用 stdout 缓冲区< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > setbuf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (stdout, < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > NULL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 使用整型来表示真和假两种状态< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > handsome < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ; < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 帅不帅[0 丑， ： " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > scanf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > handsome);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (handsome) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 你真的很帅！！！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 你真的很丑！！！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < / div > < / div > < h3 id = "_1-6-3-宏定义的布尔类型" tabindex = "-1" > 1.6.3 宏定义的布尔类型 < a class = "header-anchor" href = "#_1-6-3-宏定义的布尔类型" aria-label = "Permalink to "1.6.3 宏定义的布尔类型"" > < / a > < / h3 > < ul > < li > < p > 判断真假的时候，以 < code > 0< / code > 为 < code > false< / code > （假）、< code > 1< / code > 为 < code > true< / code > （真），并不直观；所以，我们可以借助 C 语言的宏定义。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 宏定义< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #define< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > BOOL< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #define< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > TRUE< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #define< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > FALSE< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
2024-08-17 08:49:53 +02:00
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 禁用 stdout 缓冲区< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > setbuf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (stdout, < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > NULL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > BOOL handsome < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 帅不帅[FALSE 丑， ： " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > scanf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > handsome);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (handsome) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 你真的很帅！！！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 你真的很丑！！！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < / div > < / div > < h3 id = "_1-6-4-c99-标准中的布尔类型" tabindex = "-1" > 1.6.4 C99 标准中的布尔类型 < a class = "header-anchor" href = "#_1-6-4-c99-标准中的布尔类型" aria-label = "Permalink to "1.6.4 C99 标准中的布尔类型"" > < / a > < / h3 > < ul > < li > < p > 在 C99 中提供了 < code > _Bool< / code > 关键字，用于表示布尔类型；其实，< code > _Bool< / code > 类型的值是整数类型的别名，和一般整型不同的是，< code > _Bool< / code > 类型的值只能赋值为 < code > 0< / code > 或 < code > 1< / code > （ < code > 非 0< / code > 的值都会被存储为 < code > 1< / code > 。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
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< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
2024-08-17 08:49:53 +02:00
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 禁用 stdout 缓冲区< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > setbuf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (stdout, < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > NULL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
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< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > temp;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 使用 int 类型的变量临时存储输入< / span > < / span >
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< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > _Bool< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > handsome < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 帅不帅[0 丑， ： " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
2024-08-17 08:49:53 +02:00
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > scanf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > temp);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 将输入值转换为 _Bool 类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > handsome < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (temp < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > !=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (handsome) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 你真的很帅！！！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 你真的很丑！！！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < / div > < / div > < h3 id = "_1-6-5-c99-标准头文件中的布尔类型-推荐" tabindex = "-1" > 1.6.5 C99 标准头文件中的布尔类型（推荐） < a class = "header-anchor" href = "#_1-6-5-c99-标准头文件中的布尔类型-推荐" aria-label = "Permalink to "1.6.5 C99 标准头文件中的布尔类型（推荐）"" > < / a > < / h3 > < ul > < li > 在 C99 中提供了一个头文件 < code > < stdbool.h> < / code > ，定义了 < code > bool< / code > 代表 < code > _Bool< / code > ， < code > false< / code > 代表 < code > 0< / code > ， < code > true< / code > 代表 < code > 1< / code > 。< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 在 C++、Java 等高级编程语言中是有 boolean 类型的关键字的。< / p > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdbool.h> < / span > < / span >
2024-08-17 08:35:26 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < string.h> < / span > < / span >
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< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
2024-08-17 08:35:26 +02:00
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 禁用 stdout 缓冲区< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > setbuf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (stdout, < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > NULL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#E36209;--shiki-dark:#FFAB70;" > input< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > [< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ];< / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > bool< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > handsome < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > false< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-17 08:35:26 +02:00
< span class = "line" > < / span >
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< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 帅不帅[false 丑， ： " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
2024-08-17 08:35:26 +02:00
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > scanf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %s< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , input);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 使用 %s 读取字符串< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 将输入字符串转换为布尔值< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > strcmp< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (input, < / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " true" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ==< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > handsome < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > true< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > strcmp< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (input, < / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " false" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ==< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > handsome < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > false< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 无效输入！< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
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< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (handsome) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 你真的很帅！！！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 你真的很丑！！！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < span class = "line-number" > 27< / span > < br > < span class = "line-number" > 28< / span > < br > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < span class = "line-number" > 31< / span > < br > < span class = "line-number" > 32< / span > < br > < span class = "line-number" > 33< / span > < br > < / div > < / div > < h2 id = "_1-7-数据类型转换" tabindex = "-1" > 1.7 数据类型转换 < a class = "header-anchor" href = "#_1-7-数据类型转换" aria-label = "Permalink to "1.7 数据类型转换"" > < / a > < / h2 > < h3 id = "_1-7-1-概述" tabindex = "-1" > 1.7.1 概述 < a class = "header-anchor" href = "#_1-7-1-概述" aria-label = "Permalink to "1.7.1 概述"" > < / a > < / h3 > < ul > < li > 在 C 语言编程中，经常需要对不同类型的数据进行运算，运算前需要先转换为同一类型，再运算。为了解决数据类型不一致的问题，需要对数据的类型进行转换。< / li > < / ul > < h3 id = "_1-7-2-自动类型转换-隐式转换" tabindex = "-1" > 1.7.2 自动类型转换（隐式转换） < a class = "header-anchor" href = "#_1-7-2-自动类型转换-隐式转换" aria-label = "Permalink to "1.7.2 自动类型转换（隐式转换）"" > < / a > < / h3 > < h4 id = "_1-7-2-1-运算过程中的自动类型转换" tabindex = "-1" > 1.7.2.1 运算过程中的自动类型转换 < a class = "header-anchor" href = "#_1-7-2-1-运算过程中的自动类型转换" aria-label = "Permalink to "1.7.2.1 运算过程中的自动类型转换"" > < / a > < / h4 > < ul > < li > 不同类型的数据进行混合运算的时候，会发生数据类型转换，< code > 窄类型会自动转换为宽类型< / code > ，这样就不会造成精度损失。< / li > < / ul > < p > < img src = "/c/assets/14.DAgmsf-w.png" alt = "" loading = "lazy" > < / p > < ul > < li > 转换规则： < ul > < li > ① 不同类型的整数进行运算的时候，窄类型整数会自动转换为宽类型整数。< / li > < li > ② 不同类型的浮点数进行运算的时候，精度小的类型会自动转换为精度大的类型。< / li > < li > ③ 整数和浮点数进行运算的时候，整数会自动转换为浮点数。< / li > < / ul > < / li > < li > 转换方向：< / li > < / ul > < p > < img src = "/c/assets/15.B2iC37fw.png" alt = "" loading = "lazy" > < / p > < div class = "warning custom-block github-alert" > < p class = "custom-block-title" > WARNING< / p > < p > < / p > < p > 最好避免无符号整数与有符号整数的混合运算，因为这时 C 语言会自动将 signed int 转为 unsigned int ，可能不会得到预期的结果。< / p > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > /**< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > * 不同的整数类型混合运算时，宽度较小的类型会提升为宽度较大的类型，比如 short 转为 int ， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > */< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > short< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 20< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // s1 是 short 类型， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > result < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > s1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " result = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , result);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > unsigned< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 20< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // n2 是有符号， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > result < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n3;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " result = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , result);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > /**< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > * 不同的浮点数类型混合运算时，宽度较小的类型转为宽度较大的类型，比如 float 转为 double ， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > */< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > float< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > f1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1.25< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > f< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 4.58667435< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // f1 是 float 类型， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > result < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > f1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d2;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " result = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.8lf< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , result);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > /**< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > * 整型与浮点型运算，整型转为浮点型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > */< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n4 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1.67< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // n4 是 int 类型， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > result < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n4 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d3;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2lf< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , result);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < / div > < / div > < h4 id = "_1-7-2-2-赋值时的自动类型转换" tabindex = "-1" > 1.7.2.2 赋值时的自动类型转换 < a class = "header-anchor" href = "#_1-7-2-2-赋值时的自动类型转换" aria-label = "Permalink to "1.7.2.2 赋值时的自动类型转换"" > < / a > < / h4 > < ul > < li > 在赋值运算中，赋值号两边量的数据类型不同时，等号右边的类型将转换为左边的类型。< / li > < li > 如果窄类型赋值给宽类型，不会造成精度损失；如果宽类型赋值给窄类型，会造成精度损失。< / li > < / ul > < p > < img src = "/c/assets/16.BlE3ZFud.png" alt = "" loading = "lazy" > < / p > < div class = "warning custom-block github-alert" > < p class = "custom-block-title" > WARNING< / p > < p > < / p > < p > C 语言在检查类型匹配方面不太严格，最好不要养成这样的习惯。< / p > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 赋值：窄类型赋值给宽类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a1;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " a2: < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2f\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a2: 10.00< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 转换：将宽类型转换为窄类型< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10.5< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b1;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " b2: < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , b2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // b2: 10< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-05 03:42:09 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < / div > < / div > < h3 id = "_1-6-3-强制类型转换" tabindex = "-1" > 1.6.3 强制类型转换 < a class = "header-anchor" href = "#_1-6-3-强制类型转换" aria-label = "Permalink to "1.6.3 强制类型转换"" > < / a > < / h3 > < ul > < li > 隐式类型转换中的宽类型赋值给窄类型，编译器是会产生警告的，提示程序存在潜在的隐患，如果非常明确地希望转换数据类型，就需要用到强制（或显式）类型转换。< / li > < li > 语法：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 数据类型 变量名 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (类型名)变量、常量或表达式;< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "caution custom-block github-alert" > < p class = "custom-block-title" > CAUTION< / p > < p > < / p > < p > 强制类型转换可能会导致精度损失！！！< / p > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (){< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1.934< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 4.2< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > )d1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > )d2;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d1 转为 1， ， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > )(d1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d1+d2 = 6.134， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > )(< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3.5< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 6< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1.5< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 35.0 + 9.0 = 44.0 -> int = 44< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num1=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num1);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num2=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num2);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " num3=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , num3);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < / div > < / div > < h2 id = "_1-8-再谈数据类型" tabindex = "-1" > 1.8 再谈数据类型 < a class = "header-anchor" href = "#_1-8-再谈数据类型" aria-label = "Permalink to "1.8 再谈数据类型"" > < / a > < / h2 > < ul > < li > < p > 通过之前的知识， ， ， ， ， < / p > < / li > < li > < p > 首先， （ ， ） ， ： < / p > < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 这些存储单元中，存储的都是 0 和 1 这样的数据，因为计算机只能识别二进制数。< / p > < / div > < p > < img src = "/c/assets/17.CBpay1zM.svg" alt = "" loading = "lazy" > < / p > < ul > < li > 并且，为了方便管理，每个独立的小单元格，即：存储单元，都有自己唯一的编号（内存地址），如下所示：< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 之所以，要给每个存储单元加上内存地址，就是为了< code > 加快< / code > 数据的< code > 存取速度< / code > ，可以类比生活中的< code > 字典< / code > 以及< code > 快递单号< / code > 。< / p > < / div > < p > < img src = "/c/assets/18.g66usGgc.svg" alt = "" loading = "lazy" > < / p > < ul > < li > 我们在定义变量的时候，是这么定义的，如下所示：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 上述的代码其实透露了三个重要的信息：< / p > < ul > < li > ① 数据存储在哪里。< / li > < li > ② 数据的长度是多少。< / li > < li > ③ 数据的处理方式。< / li > < / ul > < / div > < ul > < li > 其实，在编译器对程序进行编译的时候，是这样做的，如下所示：< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 编译器在编译的时候，就将变量替换为内存中存储单元的内存地址（知道了你家的门牌号），这样就可以方便的进行存取数据了（解答了上述的问题 ① ）。< / li > < li > ② 变量中其实存储的是初始化值 10 在内存中存储单元的首地址，我们也知道，数据类型 int 的存储空间是 4 个字节，那么根据首地址 + 4 个字节就可以完整的将数据从内存空间中取出来或存进去（解答了上述的问题 ② ）。< / li > < li > ③ 我们知道，数据在计算机底层的存储方式是不一样的，如：整数在计算机底层的存储就是计算机补码的方式，浮点数在计算机底层的存储类似
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 12< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x, x2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > y < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 67< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > y1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > y, y2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > y;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " x1=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , x2=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , x1, x2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // x1=-12, x2=12< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " y1=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > , y2=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , y1, y2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // y1=67, y2=-67< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < / div > < / div > < ul > < li > 示例：加、减、乘、除（整数之间做除法时，结果只保留整数部分而舍弃小数部分）、取模< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 5< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 2< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > + < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, b, a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 5 + 2 = 7< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > - < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, b, a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 5 - 2 = 3< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > × < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, b, a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 5 × < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > / < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, b, a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > /< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 5 / 2 = 2< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %%< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, b, a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 5 % 2 = 1< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < / div > < / div > < ul > < li > 示例：取模（运算结果的符号与被模数也就是第一个操作数相同。）< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > res1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 10 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %%< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , res1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 10 % 3 = 1< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > res2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " -10 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %%< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , res2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // -10 % 3 = -1< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > res3 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 10 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %%< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > -3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , res3);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 10 % -3 = 1< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > res4 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " -10 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %%< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > -3 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , res4);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // -10 % -3 = -1< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < / div > < / div > < ul > < li > 示例：自增和自减< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i1 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i2 < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 20< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i1< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i = 10< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i1 = 11< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i1;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i = 12< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i1 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i1);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i1 = 12< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i2< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > --< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i = 20< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i2 = 19< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > --< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i2;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i = 18< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " i2 = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i2);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // i2 = 18< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > /*< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 随意给出一个整数，打印显示它的个位数，十位数，百位数的值。< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 格式如下：< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 数字xxx的情况如下： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 个位数：< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 十位数：< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 百位数：< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 例如：< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 数字153的情况如下： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 个位数： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 十位数： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 百位数： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > */< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 153< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > bai < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > /< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > shi < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 100< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > /< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ge < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 百位为：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , bai);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 十位为：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , shi);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 个位为：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , ge);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-05 08:44:32 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < span class = "line-number" > 27< / span > < br > < span class = "line-number" > 28< / span > < br > < / div > < / div > < h2 id = "_2-3-关系运算符-比较运算符" tabindex = "-1" > 2.3 关系运算符（比较运算符） < a class = "header-anchor" href = "#_2-3-关系运算符-比较运算符" aria-label = "Permalink to "2.3 关系运算符（比较运算符）"" > < / a > < / h2 > < ul > < li > 常见的关系运算符，如下所示：< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > 运算符< / th > < th > 描述< / th > < th > 操作数个数< / th > < th > 组成的表达式的值< / th > < th > 副作用< / th > < / tr > < / thead > < tbody > < tr > < td > < code > ==< / code > < / td > < td > 相等< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < tr > < td > < code > !=< / code > < / td > < td > 不相等< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < tr > < td > < code > < < / code > < / td > < td > 小于< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < tr > < td > < code > > < / code > < / td > < td > 大于< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < tr > < td > < code > < =< / code > < / td > < td > 小于等于< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < tr > < td > < code > > =< / code > < / td > < td > 大于等于< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < / tbody > < / table > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① C 语言中，没有严格意义上的布尔类型，可以使用 0（ ） （ ） < / li > < li > ② 不要将 < code > ==< / code > 写成 < code > =< / code > ， < code > ==< / code > 是比较运算符，而 < code > =< / code > 是赋值运算符。< / li > < li > ③ < code > > =< / code > 或 < code > < =< / code > 含义是只需要满足 < code > 大于或等于< / code > 、< code > 小于或等于< / code > 其中一个条件，结果就返回真。< / li > < / ul > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 8< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 7< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " a > b 的结果是：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a > b 的结果是： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " a > = b 的结果是：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a > = b 的结果是： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " a < b 的结果是：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a < b 的结果是： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " a < = b 的结果是：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a < = b 的结果是： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " a == b 的结果是：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ==< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a == b 的结果是： < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " a != b 的结果是：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > !=< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a != b 的结果是： < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-05 08:17:14 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < / div > < / div > < h2 id = "_2-4-逻辑运算符" tabindex = "-1" > 2.4 逻辑运算符 < a class = "header-anchor" href = "#_2-4-逻辑运算符" aria-label = "Permalink to "2.4 逻辑运算符"" > < / a > < / h2 > < ul > < li > 常见的逻辑运算符，如下所示：< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > 运算符< / th > < th > 描述< / th > < th > 操作数个数< / th > < th > 组成的表达式的值< / th > < th > 副作用< / th > < / tr > < / thead > < tbody > < tr > < td > < code > & & < / code > < / td > < td > 逻辑与< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < tr > < td > < code > ||< / code > < / td > < td > 逻辑或< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < tr > < td > < code > !< / code > < / td > < td > 逻辑非< / td > < td > 2< / td > < td > 0 或 1< / td > < td > ❎< / td > < / tr > < / tbody > < / table > < ul > < li > 逻辑运算符提供逻辑判断功能，用于构建更复杂的表达式，如下所示：< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > a< / th > < th > b< / th > < th > a & & b< / th > < th > a || b< / th > < th > !a< / th > < / tr > < / thead > < tbody > < tr > < td > 1（ ） < / td > < td > 1（ ） < / td > < td > 1（ ） < / td > < td > 1（ ） < / td > < td > 0（ ） < / td > < / tr > < tr > < td > 1（ ） < / td > < td > 0（ ） < / td > < td > 0（ ） < / td > < td > 1（ ） < / td > < td > 0（ ） < / td > < / tr > < tr > < td > 0（ ） < / td > < td > 1（ ） < / td > < td > 0（ ） < / td > < td > 1（ ） < / td > < td > 1（ ） < / td > < / tr > < tr > < td > 0（ ） < / td > < td > 0（ ） < / td > < td > 0（ ） < / td > < td > 0（ ） < / td > < td > 1（ ） < / td > < / tr > < / tbody > < / table > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 对于逻辑运算符来说，任何< code > 非零值< / code > 都表示< code > 真< / code > ， < code > 零值< / code > 表示< code > 假< / code > ，如：< code > 5 || 0< / code > 返回 < code > 1< / code > ， < code > 5 & & 0< / code > 返回 < code > 0< / code > 。< / li > < li > ② 逻辑运算符的理解： < ul > < li > < code > & & < / code > 的理解就是：< code > 两边条件，同时满足< / code > 。< / li > < li > < code > ||< / code > 的理解就是：< code > 两边条件，二选一< / code > 。< / li > < li > < code > !< / code > 的理解就是：< code > 条件取反< / code > 。< / li > < / ul > < / li > < li > ③ 短路现象： < ul > < li > 对于 < code > a & & b< / code > 操作来说，当 a 为假(或 0 )时，因为 < code > a & & b< / code > 结果必定为 0， < / li > < li > 对于 < code > a || b< / code > 操作来说，当 a 为真(或非 0 )时，因为 < code > a || b< / code > 结果必定为 1， < / li > < / ul > < / li > < / ul > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 请输入整数a的值： " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > scanf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 请输入整数b的值： " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > scanf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > > < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, b);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, b);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, b);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 短路现象< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > j < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > j< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 床前明月光< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 这行代码不会执行< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 我叫郭德纲< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , j);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > //10< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < / div > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 短路现象< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > j < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 10< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ||< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > j< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 床前明月光 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 我叫郭德纲 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 这行代码不会被执行< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , j);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > //10< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:59:59 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < / div > < / div > < h2 id = "_2-5-赋值运算符" tabindex = "-1" > 2.5 赋值运算符 < a class = "header-anchor" href = "#_2-5-赋值运算符" aria-label = "Permalink to "2.5 赋值运算符"" > < / a > < / h2 > < ul > < li > 常见的赋值运算符，如下所示：< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > 运算符< / th > < th > 描述< / th > < th > 操作数个数< / th > < th > 组成的表达式的值< / th > < th > 副作用< / th > < / tr > < / thead > < tbody > < tr > < td > < code > ==< / code > < / td > < td > 赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > +=< / code > < / td > < td > 相加赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > -=< / code > < / td > < td > 相减赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > *=< / code > < / td > < td > 相乘赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > /=< / code > < / td > < td > 相除赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > %=< / code > < / td > < td > 取余赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > < < =< / code > < / td > < td > 左移赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > > > =< / code > < / td > < td > 右移赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > & =< / code > < / td > < td > 按位与赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > ^=< / code > < / td > < td > 按位异或赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > |=< / code > < / td > < td > 按位或赋值< / td > < td > 2< / td > < td > 左边操作数的值< / td > < td > ✅< / td > < / tr > < / tbody > < / table > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 赋值运算符的第一个操作数（左值）必须是变量的形式，第二个操作数可以是任何形式的表达式。< / li > < li > ② 赋值运算符的副作用针对第一个操作数。< / li > < / ul > < / div > < ul > < li > 示例：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a = a + 3< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " a = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // a = 6< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // b = b - 3< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " b = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , b);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // b = 0< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > c < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > c < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // c = c * 3< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " c = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , c);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // c = 9< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > d < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > /=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d = d / 3< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " d = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , d);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // d = 1< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > e < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > e < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %=< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // e = e % 3< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " e = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , e);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // e = 0< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-07-19 09:59:59 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < / div > < / div > < h2 id = "_2-6-位运算符-了解" tabindex = "-1" > 2.6 位运算符（了解） < a class = "header-anchor" href = "#_2-6-位运算符-了解" aria-label = "Permalink to "2.6 位运算符（了解）"" > < / a > < / h2 > < h3 id = "_2-6-1-概述" tabindex = "-1" > 2.6.1 概述 < a class = "header-anchor" href = "#_2-6-1-概述" aria-label = "Permalink to "2.6.1 概述"" > < / a > < / h3 > < ul > < li > C 语言提供了一些位运算符， （ ） < / li > < li > 常见的位运算符，如下所示。< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > 运算符< / th > < th > 描述< / th > < th > 操作数个数< / th > < th > 运算规则< / th > < th > 副作用< / th > < / tr > < / thead > < tbody > < tr > < td > < code > & < / code > < / td > < td > 按位与< / td > < td > 2< / td > < td > 两个二进制位都为 1 ，结果为 1 ，否则为 0 。< / td > < td > ❎< / td > < / tr > < tr > < td > < code > |< / code > < / td > < td > 按位或< / td > < td > 2< / td > < td > 两个二进制位只要有一个为 1（ < / td > < td > ❎< / td > < / tr > < tr > < td > < code > ^< / code > < / td > < td > 按位异或< / td > < td > 2< / td > < td > 两个二进制位一个为 0 ，一个为 1 ，结果为 1， < / td > < td > ❎< / td > < / tr > < tr > < td > < code > ~< / code > < / td > < td > 按位取反< / td > < td > 2< / td > < td > 将每一个二进制位变成相反值，即 0 变成 1 ， < / td > < td > ❎< / td > < / tr > < tr > < td > < code > < < < / code > < / td > < td > 二进制左移< / td > < td > 2< / td > < td > 将一个数的各二进制位全部左移指定的位数，左 边的二进制位丢弃，右边补 0。< / td > < td > ❎< / td > < / tr > < tr > < td > < code > > > < / code > < / td > < td > 二进制右移< / td > < td > 2< / td > < td > 将一个数的各二进制位全部右移指定的位数，正数左补 0， ， < / td > < td > ❎< / td > < / tr > < / tbody > < / table > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 操作数在进行位运算的时候，以它的补码形式计算！！！< / p > < / div > < h3 id = "_2-6-2-输出二进制位" tabindex = "-1" > 2.6.2 输出二进制位 < a class = "header-anchor" href = "#_2-6-2-输出二进制位" aria-label = "Permalink to "2.6.2 输出二进制位"" > < / a > < / h3 > < ul > < li > < p > 在 C 语言中，< code > printf< / code > 是没有提供输出二进制位的格式占位符的；但是，我们可以手动实现，以方便后期操作。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > /**< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > * 获取指定整数的二进制表示< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > * < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > @param< / span > < span style = "--shiki-light:#E36209;--shiki-dark:#FFAB70;" > num< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 整数< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > * < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > @return< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > 二进制表示的字符串，不包括前导的 ' 0b' 字符< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > */< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char*< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > getBinary< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#E36209;--shiki-dark:#FFAB70;" > num< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > static< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > char< / span > < span style = "--shiki-light:#E36209;--shiki-dark:#FFAB70;" > binaryString< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > [< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 33< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ];< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i, j;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > sizeof< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (num) < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 8< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , j < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ; i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ; i< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > --< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , j< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > const< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > bit < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > > < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i) < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#E36209;--shiki-dark:#FFAB70;" > binaryString< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > [j] < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > bit < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' 0' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#E36209;--shiki-dark:#FFAB70;" > binaryString< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > [j] < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \0< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > binaryString;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > a < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 17< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > b < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 12< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 整数 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 的二进制表示：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %s< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , a, < / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > getBinary< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (a));< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 整数 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 的二进制表示：< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %s< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , b, < / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > getBinary< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (b));< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-23 10:13:42 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < span class = "line-number" > 27< / span > < br > < span class = "line-number" > 28< / span > < br > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < / div > < / div > < h3 id = "_2-6-3-按位与" tabindex = "-1" > 2.6.3 按位与 < a class = "header-anchor" href = "#_2-6-3-按位与" aria-label = "Permalink to "2.6.3 按位与"" > < / a > < / h3 > < ul > < li > < p > 按位与 < code > & < / code > 的运算规则是：如果二进制对应的位上都是 1 才是 1 ，否则为 0 ，即：< / p > < ul > < li > < code > 1 & 1< / code > 的结果是 < code > 1< / code > 。< / li > < li > < code > 1 & 0< / code > 的结果是 < code > 0< / code > 。< / li > < li > < code > 0 & 1< / code > 的结果是 < code > 0< / code > 。< / li > < li > < code > 0 & 0< / code > 的结果是 < code > 0< / code > 。< / li > < / ul > < / li > < li > < p > 示例：< code > 9 & 7 = 1< / code > < / p > < / li > < / ul > < p > < img src = "/c/assets/22.BPFvANo_.svg" alt = "" loading = "lazy" > < / p > < ul > < li > 示例：< code > -9 & 7 = 7< / code > < / li > < / ul > < p > < img src = "/c/assets/23.BSJo8a0j.svg" alt = "" loading = "lazy" > < / p > < h3 id = "_2-6-4-按位或" tabindex = "-1" > 2.6.4 按位或 < a class = "header-anchor" href = "#_2-6-4-按位或" aria-label = "Permalink to "2.6.4 按位或"" > < / a > < / h3 > < ul > < li > < p > 按位与 < code > |< / code > 的运算规则是：如果二进制对应的位上只要有 1 就是 1 ，否则为 0 ，即：< / p > < ul > < li > < code > 1 | 1< / code > 的结果是 < code > 1< / code > 。< / li > < li > < code > 1 | 0< / code > 的结果是 < code > 1< / code > 。< / li > < li > < code > 0 | 1< / code > 的结果是 < code > 1< / code > 。< / li > < li > < code > 0 | 0< / code > 的结果是 < code > 0< / code > 。< / li > < / ul > < / li > < li > < p > 示例：< code > 9 | 7 = 15< / code > < / p > < / li > < / ul > < p > < img src = "/c/assets/24.r8ZG8Rvh.svg" alt = "" loading = "lazy" > < / p > < ul > < li > 示例：< code > -9 | 7 = -9< / code > < / li > < / ul > < p > < img src = "/c/assets/25.rY0SPMAM.svg" alt = "" loading = "lazy" > < / p > < h3 id = "_2-6-5-按位异或" tabindex = "-1" > 2.6.5 按位异或 < a class = "header-anchor" href = "#_2-6-5-按位异或" aria-label = "Permalink to "2.6.5 按位异或"" > < / a > < / h3 > < ul > < li > 按位与 < code > ^< / code > 的运算规则是：如果二进制对应的位上一个为 1 一个为 0 就为 1 ，否则为 0 ，即： < ul > < li > < code > 1 ^ 1< / code > 的结果是 < code > 0< / code > 。< / li > < li > < code > 1 ^ 0< / code > 的结果是 < code > 1< / code > 。< / li > < li > < code > 0 ^ 1< / code > 的结果是 < code > 1< / code > 。< / li > < li > < code > 0 ^ 0< / code > 的结果是 < code > 0< / code > 。< / li > < / ul > < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 按位异或的场景有：< / p > < ul > < li > ① 交换两个数值：异或操作可以在不使用临时变量的情况下交换两个变量的值。< / li > < li > ② 加密或解密：异或操作用于简单的加密和解密算法。< / li > < li > ③ 错误检测和校正： （ < / li > < li > ……< / li > < / ul > < / div > < ul > < li > 示例：< code > 9 ^ 7 = 14< / code > < / li > < / ul > < p > < img src = "/c/assets/26.CX-aIacs.svg" alt =
2024-07-19 09:46:50 +02:00
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > m < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 110< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 20< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > result < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > m < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ?< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > m < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > :< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " result = < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , result);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // result = 110< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-26 03:39:51 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < / div > < / div > < h2 id = "_2-8-运算符优先级" tabindex = "-1" > 2.8 运算符优先级 < a class = "header-anchor" href = "#_2-8-运算符优先级" aria-label = "Permalink to "2.8 运算符优先级"" > < / a > < / h2 > < ul > < li > C 语言中运算符的优先级，如下所示：< / li > < / ul > < table tabindex = "0" > < thead > < tr > < th > < strong > 优先级< / strong > < / th > < th > < strong > 运算符< / strong > < / th > < th > < strong > 名称或含义< / strong > < / th > < th > < strong > 结合方向< / strong > < / th > < / tr > < / thead > < tbody > < tr > < td > < strong > 1< / strong > < / td > < td > < code > []< / code > < / td > < td > 数组下标< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < / td > < td > < code > ()< / code > < / td > < td > 圆括号< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > .< / code > < / td > < td > 成员选择（对象）< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > -> < / code > < / td > < td > 成员选择（指针）< / td > < td > < / td > < / tr > < tr > < td > < strong > 2< / strong > < / td > < td > < code > -< / code > < / td > < td > 负号运算符< / td > < td > ⬅️（从右到左）< / td > < / tr > < tr > < td > < / td > < td > < code > （类型）< / code > < / td > < td > 强制类型转换< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > ++< / code > < / td > < td > 自增运算符< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > --< / code > < / td > < td > 自减运算符< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > *< / code > < / td > < td > 取值运算符< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > & < / code > < / td > < td > 取地址运算符< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > !< / code > < / td > < td > 逻辑非运算符< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > ~< / code > < / td > < td > 按位取反运算符< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > sizeof< / code > < / td > < td > 长度运算符< / td > < td > < / td > < / tr > < tr > < td > < strong > 3< / strong > < / td > < td > < code > /< / code > < / td > < td > 除< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < / td > < td > < code > *< / code > < / td > < td > 乘< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > %< / code > < / td > < td > 余数（取模）< / td > < td > < / td > < / tr > < tr > < td > < strong > 4< / strong > < / td > < td > < code > +< / code > < / td > < td > 加< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < / td > < td > < code > -< / code > < / td > < td > 减< / td > < td > < / td > < / tr > < tr > < td > < strong > 5< / strong > < / td > < td > < code > < < < / code > < / td > < td > 左移< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < / td > < td > < code > > > < / code > < / td > < td > 右移< / td > < td > < / td > < / tr > < tr > < td > < strong > 6< / strong > < / td > < td > < code > > < / code > < / td > < td > 大于< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < / td > < td > < code > > =< / code > < / td > < td > 大于等于< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > < < / code > < / td > < td > 小于< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > < =< / code > < / td > < td > 小于等于< / td > < td > < / td > < / tr > < tr > < td > < strong > 7< / strong > < / td > < td > < code > ==< / code > < / td > < td > 等于< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < / td > < td > < code > !=< / code > < / td > < td > 不等于< / td > < td > < / td > < / tr > < tr > < td > < strong > 8< / strong > < / td > < td > < code > & < / code > < / td > < td > 按位与< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < strong > 9< / strong > < / td > < td > < code > ^< / code > < / td > < td > 按位异或< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < strong > 10< / strong > < / td > < td > < code > |< / code > < / td > < td > 按位或< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < strong > 11< / strong > < / td > < td > < code > & & < / code > < / td > < td > 逻辑与< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < strong > 12< / strong > < / td > < td > < code > ||< / code > < / td > < td > 逻辑或< / td > < td > ➡️（从左到右）< / td > < / tr > < tr > < td > < strong > 13< / strong > < / td > < td > < code > ?:< / code > < / td > < td > 条件运算符< / td > < td > ⬅️（从右到左）< / td > < / tr > < tr > < td > < strong > 14< / strong > < / td > < td > < code > =< / code > < / td > < td > 赋值运算符< / td > < td > ⬅️（从右到左）< / td > < / tr > < tr > < td > < / td > < td > < code > /=< / code > < /
< script > w i n d o w . _ _ V P _ H A S H _ M A P _ _ = J S O N . p a r s e ( " { \ " i n d e x . m d \ " : \ " D g a 0 t M F 5 \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 0 _ x d x _ i n d e x . m d \ " : \ " g 0 R G Y f W R \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 1 _ x d x _ i n d e x . m d \ " : \ " C r a I n C y H \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 2 _ x d x _ i n d e x . m d \ " : \ " H O J W h K p j \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 3 _ x d x _ i n d e x . m d \ " : \ " B W 5 r F Q 5 0 \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 4 _ x d x _ i n d e x . m d \ " : \ " D A B E M Z S O \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 5 _ x d x _ i n d e x . m d \ " : \ " C G b N 5 w s s \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 6 _ x d x _ i n d e x . m d \ " : \ " C I G N a K Y V \ " , \ " n o t e s _ 0 4 _ l i n u x _ 0 1 _ x d x _ i n d e x . m d \ " : \ " C 9 I a t K s j \ " , \ " n o t e s _ a b o u t _ i n d e x . m d \ " : \ " D L u Q g C _ 8 \ " , \ " n o t e s _ i n d e x . m d \ " : \ " C e V - u J 5 V \ " } " ) ; w i n d o w . _ _ V P _ S I T E _ D A T A _ _ = J S O N . p a r s e ( " { \ " l a n g \ " : \ " z h - C N \ " , \ " d i r \ " : \ " l t r \ " , \ " t i t l e \ " : \ " 许 大 仙 \ " , \ " t i t l e T e m p l a t e \ " : \ " H i ， 终 于 等 到 你 \ " , \ " d e s c r i p t i o n \ " : \ " 许 大 仙 前 端 、 J a v a 、 大 数 据 、 云 原 生 \ " , \ " b a s e \ " : \ " / c / \ " , \ " h e a d \ " : [ ] , \ " r o u t e r \ " : { \ " p r e f e t c h L i n k s \ " : t r u e } , \ " a p p e a r a n c e \ " : t r u e , \ " t h e m e C o n f i g \ " : { \ " l a s t U p d a t e d T e x t \ " : \ " 上 次 更 新 \ " , \ " r e t u r n T o T o p L a b e l \ " : \ " 返 回 顶 部 \ " , \ " s e a r c h \ " : { \ " p r o v i d e r \ " : \ " l o c a l \ " } , \ " l o g o \ " : \ " / l o g o . s v g \ " , \ " n a v \ " : [ { \ " t e x t \ " : \ " 首 页 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / \ " } , { \ " t e x t \ " : \ " 计 组 6 件 套 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / c o a 6 / n o t e s / \ " } , { \ " t e x t \ " : \ " 编 程 语 言 \ " , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " c / c + + \ " , \ " l i n k \ " : \ " / n o t e s / \ " } , { \ " t e x t \ " : \ " 前 端 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / w e b - d e s i g n / n o t e s / \ " } , { \ " t e x t \ " : \ " J a v a \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / j a v a / n o t e s / \ " } , { \ " t e x t \ " : \ " 大 数 据 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / b i g - d a t a / n o t e s / \ " } , { \ " t e x t \ " : \ " 云 原 生 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / l i n u x / n o t e s / \ " } , { \ " t e x t \ " : \ " G o \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / g o / n o t e s / \ " } , { \ " t e x t \ " : \ " P y t h o n \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / p y t h o n / n o t e s / \ " } ] } , { \ " t e x t \ " : \ " 数 据 库 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / d b / n o t e s / \ " } , { \ " t e x t \ " : \ " 开 源 软 件 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / o p e n - s o f t w a r e / n o t e s / \ " } , { \ " t e x t \ " : \ " 关 于 我 \ " , \ " l i n k \ " : \ " / n o t e s / a b o u t / \ " } ] , \ " s i d e b a r \ " : { \ " / n o t e s / \ " : [ { \ " t e x t \ " : \ " C 语 言 基 础 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " 编 程 基 础 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 0 _ x d x / \ " } , { \ " t e x t \ " : \ " C 语 言 入 门 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 1 _ x d x / \ " } , { \ " t e x t \ " : \ " 变 量 和 进 制 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 2 _ x d x / \ " } , { \ " t e x t \ " : \ " 数 据 类 型 和 运 算 符 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 3 _ x d x / \ " } , { \ " t e x t \ " : \ " 流 程 控 制 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 4 _ x d x / \ " } , { \ " t e x t \ " : \ " 数 组 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 5 _ x d x / \ " } , { \ " t e x t \ " : \ " 指 针 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 6 _ x d x / \ " } , { \ " t e x t \ " : \ " 函 数 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 7 _ x d x / \ " } , { \ " t e x t \ " : \ " 预 处 理 器 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 8 _ x d x / \ " } , { \ " t e x t \ " : \ " 自 定 义 数 据 类 型 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 9 _ x d x / \ " } , { \ " t e x t \ " : \ " 内 存 管 理 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 1 0 _ x d x / \ " } , { \ " t e x t \ " : \ " 文 件 操 作 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 1 1 _ x d x / \ " } , { \ " t e x t \ " : \ " 调 试 工 具 和 调 试 技 巧 （ g d b 和 m a k e ） \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - b a s i c / 1 3 _ x d x / \ " } , { \ " t e x t \ " : \ " 常 用 库 函 数 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 1 3 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " C 语 言 高 级 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " 变 量 和 内 存 分 布 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 1 _ x d x / \ " } , { \ " t e x t \ " : \ " 指 针 强 化 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 2 _ x d x / \ " } , { \ " t e x t \ " : \ " 结 构 体 和 文 件 的 高 级 用 法 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 3 _ x d x / \ " } , { \ " t e x t \ " : \ " 链 表 和 回 调 函 数 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 4 _ x d x / \ " } , { \ " t e x t \ " : \ " 编 译 过 程 和 面 向 接 口 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 5 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " 项 目 构 建 工 具 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " m e s o n \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " m e s o n 入 门 \ " , \ " l i n k \ " : \ " / n o t e s / 0 3 _ b u i l d / 0 1 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " C m a k e \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " C m a k e 入 门 \ " , \ " l i n k \ " : \ " / n o t e s / 0 3 _ b u i l d / 0 1 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " C o n a n \ " , \ " l i n k \ " : \ " / n o t e s / 0 3 _ b u i l d / 0 1 _ $ { c o m m o n D i r e c t o r y N a m e } / \ " } , { \ " t e x t \ " : \ " G r a d l e \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " G r a d l e 入 门 \ " , \ " l i n k \ " : \ " / n o t e s / 0 3 _ b u i l d / 0 1 _ x d x / \ " } ] } ] } , { \ " t e x t \ " : \ " L i n u x \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " L i n u x 初 识 和 安 装 \ " , \ " l i n k \ " : \ " / n o t e s / 0 4 _ l i n u x / 0 1 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " C + + 基 础 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " C + + <EFBFBD>
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