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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 >
< 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 > ① 表达式可以是任何类型的数据类型、变量或常量。< / li > < li > ② 返回某种数据类型或某个值占用的字节数量，并且 < code > sizeof(...)< / code > 的< code > 返回值类型< / code > 是 < code > size_t< / code > 。< / li > < li > ③ 在 < code > printf< / code > 中使用占位符 < code > %zu< / code > 来处理 < code > size_t< / code > 类型的值。< / 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 >
< 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 >
2024-07-19 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 > < / div > < / div > < h3 id = "_1-2-9-数值溢出" tabindex = "-1" > 1.2.9 数值溢出 < a class = "header-anchor" href = "#_1-2-9-数值溢出" aria-label = "Permalink to "1.2.9 数值溢出"" > < / a > < / h3 > < ul > < li > < p > 所谓的数值溢出指的是：当超过一个数据类型能够存放的最大范围的时候，数值就会溢出。< / p > < ul > < li > 如果达到了最大值，再进行加法计算，数据就会超过该类型能够表示的最大值，叫做上溢出。< / li > < li > 如果这个数目前是最小值，再进行减法计算， 数据就会超过该类型的最小值， 叫做下溢出。< / li > < / ul > < / li > < li > < p > 在 C 语言中，< code > 整数< / code > 的< code > 数据类型< / code > 分为< code > 无符号< / code > 和< code > 有符号< / code > 的，其在底层表示和存储是不一样的，即：< / p > < ul > < li > < code > 无符号整数不使用最高位作为符号位< / code > ，所有的位都用于表示数值，如：对于一个 4 位无符号整数，二进制表示的范围是从 0000 到 1111 ，那么十进制表示的范围是从 0 到 15。< / li > < li > < code > 有符号整数使用最高位作为符号位< / code > ，这意味着它们可以表示正数和负数，通常使用补码来表示有符号整数。在补码表示法中：最高位为 0 表示正数、最高位为 1 表示负数， ： ， （ ） （ ） ， （ ） （ ） < / li > < / ul > < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > 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。< / li > < li > 在 C 语言中，有符号整数，最高位是符号位，用于表示正负数。< / li > < / ul > < / div > < ul > < li > < p > 对于无符号的数值溢出：< / p > < ul > < li > 当数据到达最大值的时候，再加 1 就会回到无符号数的最小值。< / li > < li > 当数据达到最小值的时候，再减 1 就会回到无符号数的最大值。< / li > < / ul > < / li > < li > < p > 那么，无符号的上溢出，原理就是这样的：< / p > < / li > < / ul > < p > < img src = "/c/assets/3.CceY8r_n.png" alt = "" > < / p > < ul > < li > 那么，无符号的下溢出，原理就是这样的（需要先借位，然后再减）：< / li > < / ul > < p > < img src = "/c/assets/4.DHaUgOwj.png" alt = "" > < / p > < ul > < li > < p > 对于有符号的数值溢出：< / p > < ul > < li > 当数据到达最大值的时候，再加 1 就会回到有符号数的最小值。< / li > < li > 当数据达到最小值的时候，再减 1 就会回到有符号数的最大值。< / li > < / ul > < / li > < li > < p > 那么，有符号的上溢出，原理就是这样的：< / p > < / li > < / ul > < p > < img src = "/c/assets/5.CXGaq_zh.png" alt = "" > < / p > < ul > < li > 那么，有符号的下溢出，原理就是这样的：< / li > < / ul > < p > < img src = "/c/assets/6.BrZYAEEl.png" alt = "" > < / p > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 在实际开发中，选择合适的数据类型，以避免数值溢出问题！！！< / p > < / div > < ul > < li > 示例：无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 >
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 >
2024-07-19 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 > < / div > < / div > < h2 id = "_1-3-浮点类型" tabindex = "-1" > 1.3 浮点类型 < a class = "header-anchor" href = "#_1-3-浮点类型" aria-label = "Permalink to "1.3 浮点类型"" > < / 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，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/7.DpCroFHv.png" alt = "" > < / 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/8.Cr7P0Gji.png" alt = "" > < / 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 = "_1-3-2-格式占位符" tabindex = "-1" > 1.3.2 格式占位符 < a class = "header-anchor" href = "#_1-3-2-格式占位符" aria-label = "Permalink to "1.3.2 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< / code > 形式的浮点数， <EFBFBD>
< 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 >
< 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 = "_1-3-3-字面量后缀" tabindex = "-1" > 1.3.3 字面量后缀 < a class = "header-anchor" href = "#_1-3-3-字面量后缀" aria-label = "Permalink to "1.3.3 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 >
< 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 >
< 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 = "_1-3-4-类型占用的内存大小-存储空间" tabindex = "-1" > 1.3.4 类型占用的内存大小（存储空间） < a class = "header-anchor" href = "#_1-3-4-类型占用的内存大小-存储空间" aria-label = "Permalink to "1.3.4 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 >
< 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 >
< 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 = "_1-3-5-类型的取值范围" tabindex = "-1" > 1.3.5 类型的取值范围 < a class = "header-anchor" href = "#_1-3-5-类型的取值范围" aria-label = "Permalink to "1.3.5 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 >
< 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 >
< 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 = "_1-4-字符类型" tabindex = "-1" > 1.4 字符类型 < a class = "header-anchor" href = "#_1-4-字符类型" aria-label = "Permalink to "1.4 字符类型"" > < / 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 > 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 > C 语言中没有字符串类型， （ < / li > < li > 在 C 语言中， ， （ < / li > < li > 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 = "_1-4-2-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 > 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 >
< 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 >
< 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 = "_1-4-3-类型占用的内存大小-存储空间" tabindex = "-1" > 1.4.3 类型占用的内存大小（存储空间） < a class = "header-anchor" href = "#_1-4-3-类型占用的内存大小-存储空间" aria-label = "Permalink to "1.4.3 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 >
< 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 >
< 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 = "_1-4-4-类型的取值范围" tabindex = "-1" > 1.4.4 类型的取值范围 < a class = "header-anchor" href = "#_1-4-4-类型的取值范围" aria-label = "Permalink to "1.4.4 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 >
< 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 >
< 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 = "_1-4-3-字符类型的本质" tabindex = "-1" > 1.4.3 字符类型的本质 < a class = "header-anchor" href = "#_1-4-3-字符类型的本质" aria-label = "Permalink to "1.4.3 字符类型的本质"" > < / a > < / h3 > < ul > < li > 在 C 语言中， < / li > < / ul > < p > < img src = "/c/assets/9.NlBmD7pA.png" alt = "" > < / 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/10.ZiBq6Pno.png" alt = "" > < / 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 >
< 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 >
< 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 = "_1-5-布尔类型" tabindex = "-1" > 1.5 布尔类型 < a class = "header-anchor" href = "#_1-5-布尔类型" aria-label = "Permalink to "1.5 布尔类型"" > < / 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 > 布尔值用于表示 true（ ） （ ） ， < / li > < / ul > < h3 id = "_1-5-2-早期的布尔类型" tabindex = "-1" > 1.5.2 早期的布尔类型 < a class = "header-anchor" href = "#_1-5-2-早期的布尔类型" aria-label = "Permalink to "1.5.2 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 >
< 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:#24292E;--shiki-dark:#E1E4E8;" > < / span > < / span >
< 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 >
< 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 > < h3 id = "_1-5-3-宏定义的布尔类型" tabindex = "-1" > 1.5.3 宏定义的布尔类型 < a class = "header-anchor" href = "#_1-5-3-宏定义的布尔类型" aria-label = "Permalink to "1.5.3 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 >
< 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 >
< span class = "line" > < / span >
< 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 >
< 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 > < / div > < / div > < h3 id = "_1-5-4-c99-标准中的布尔类型" tabindex = "-1" > 1.5.4 C99 标准中的布尔类型 < a class = "header-anchor" href = "#_1-5-4-c99-标准中的布尔类型" aria-label = "Permalink to "1.5.4 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 >
< 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;" > _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 >
< 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 >
< 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 > < h3 id = "_1-5-5-c99-标准头文件中的布尔类型-推荐" tabindex = "-1" > 1.5.5 C99 标准头文件中的布尔类型（推荐） < a class = "header-anchor" href = "#_1-5-5-c99-标准头文件中的布尔类型-推荐" aria-label = "Permalink to "1.5.5 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;" > < 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;" > 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 >
< 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 >
< 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 = "_1-6-数据类型转换" tabindex = "-1" > 1.6 数据类型转换 < a class = "header-anchor" href = "#_1-6-数据类型转换" aria-label = "Permalink to "1.6 数据类型转换"" > < / 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 > 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 = "_1-6-2-自动类型转换-隐式转换" tabindex = "-1" > 1.6.2 自动类型转换（隐式转换） < a class = "header-anchor" href = "#_1-6-2-自动类型转换-隐式转换" aria-label = "Permalink to "1.6.2 自动类型转换（隐式转换）"" > < / a > < / h3 > < h4 id = "_1-6-2-1-运算过程中的自动类型转换" tabindex = "-1" > 1.6.2.1 运算过程中的自动类型转换 < a class = "header-anchor" href = "#_1-6-2-1-运算过程中的自动类型转换" aria-label = "Permalink to "1.6.2.1 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/11.DAgmsf-w.png" alt = "" > < / 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/12.B2iC37fw.png" alt = "" > < / p > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / 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 >
< 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 >
< 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 = "_1-6-2-2-赋值时的自动类型转换" tabindex = "-1" > 1.6.2.2 赋值时的自动类型转换 < a class = "header-anchor" href = "#_1-6-2-2-赋值时的自动类型转换" aria-label = "Permalink to "1.6.2.2 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/14.BlE3ZFud.png" alt = "" > < / p > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / 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 >
< 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 >
2024-07-19 09:53:33 +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 = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / 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 >
< 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 > < h1 id = "第二章-运算符-⭐" tabindex = "-1" > 第二章：运算符（⭐） < a class = "header-anchor" href = "#第二章-运算符-⭐" aria-label = "Permalink to "第二章：运算符（⭐）"" > < / a > < / h1 > < h2 id = "_2-1-概述" tabindex = "-1" > 2.1 概述 < a class = "header-anchor" href = "#_2-1-概述" aria-label = "Permalink to "2.1 概述"" > < / a > < / h2 > < ul > < li > 运算符是一种特殊的符号，用于数据的运算、赋值和比较等。< / li > < li > < code > 表达式< / code > 指的是一组运算数、运算符的组合，表达式< code > 一定具有值< / code > ，一个变量或一个常量可以是表达式，变量、常量和运算符也可以组成表达式，如：< / li > < / ul > < p > < img src = "/c/assets/15.CdvhiwcU.png" alt = "" > < / p > < ul > < li > < code > 操作数< / code > 指的是< code > 参与运算< / code > 的< code > 值< / code > 或者< code > 对象< / code > ，如：< / li > < / ul > < p > < img src = "/c/assets/16.D74t3-Xt.png" alt = "" > < / p > < ul > < li > 根据< code > 操作数< / code > 的< code > 个数< / code > ，可以将运算符分为： < ul > < li > 一元运算符（一目运算符）。< / li > < li > 二元运算符（二目运算符）。< / li > < li > 三元运算符（三目运算符）。< / li > < / ul > < / li > < li > 根据< code > 功能< / code > ，可以将运算符分为： < ul > < li > 算术运算符。< / li > < li > 关系运算符（比较运算符）。< / li > < li > 逻辑运算符。< / li > < li > 赋值运算符。< / li > < li > 逻辑运算符。< / li > < li > 位运算符。< / li > < li > 三元运算符。< / li > < / ul > < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 掌握一个运算符，需要关注以下几个方面：< / p > < ul > < li > ① 运算符的含义。< / li > < li > ② 运算符操作数的个数。< / li > < li > ③ 运算符所组成的表达式。< / li > < li > ④ 运算符有无副作用，即：运算后是否会修改操作数的值。< / li > < / ul > < / div > < h2 id = "_2-2-算术运算符" tabindex = "-1" > 2.2 算术运算符 < a class = "header-anchor" href = "#_2-2-算术运算符" aria-label = "Permalink to "2.2 算术运算符"" > < / a > < / h2 > < ul > < li > 算术运算符是对数值类型的变量进行运算的，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 > 正号< / td > < td > 1< / td > < td > 操作数本身< / td > < td > ❎< / td > < / tr > < tr > < td > < code > -< / code > < / td > < td > 负号< / td > < td > 1< / td > < td > 操作数符号取反< / td > < td > ❎< / td > < / tr > < tr > < td > < code > +< / code > < / td > < td > 加号< / td > < td > 2< / td > < td > 两个操作数之和< / td > < td > ❎< / td > < / tr > < tr > < td > < code > -< / code > < / td > < td > 减号< / td > < td > 2< / td > < td > 两个操作数之差< / td > < td > ❎< / td > < / tr > < tr > < td > < code > *< / code > < / td > < td > 乘号< / td > < td > 2< / td > < td > 两个操作数之积< / td > < td > ❎< / td > < / tr > < tr > < td > < code > /< / code > < / td > < td > 除号< / td > < td > 2< / td > < td > 两个操作数之商< / td > < td > ❎< / td > < / tr > < tr > < td > < code > %< / code > < / td > < td > 取模（取余）< / td > < td > 2< / td > < td > 两个操作数相除的余数< / td > < td > ❎< / td > < / tr > < tr > < td > < code > ++< / code > < / td > < td > 自增< / td > < td > 1< / td > < td > 操作数自增前或自增后的值< / td > < td > ✅< / td > < / tr > < tr > < td > < code > --< / code > < / td > < td > 自减< / td > < td > 1< / td > < td > 操作数自减前或自减后的值< / td > < td > ✅< / td > < / tr > < / tbody > < / table > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 自增和自减：< / p > < ul > < l
< 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 >
< 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，所以可以 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 >
< 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 >
2024-07-19 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 > < / 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，任何非零值都表示真，零值表示假，如：< code > 5 || 0< / code > 返回 < code > 1< / code > ， < code > 5 & & 0< / code > 返回 < code > 0< / code > 。< / li > < li > ② 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 >
2024-07-19 10:20:52 +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/17.DdAZIfeP.png" alt = "" > < / p > < ul > < li > 示例：< code > -9 & 7 = 7< / code > < / li > < / ul > < p > < img src = "/c/assets/18.B4Zfj2jX.png" alt = "" > < / 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/19.IfpA0D5n.png" alt = "" > < / p > < ul > < li > 示例：< code > -9 | 7 = -9< / code > < / li > < / ul > < p > < img src = "/c/assets/20.CfIzYazX.png" alt = "" > < / 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/21.eHnZcbpI.png" alt = "" > < / p > < ul > < li > 示例：< code > -9 ^ 7 = -16< / code > < / li > < / ul > <
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 >
2024-07-22 08:17:16 +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 > 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 > 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 > 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 > 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 > 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 > 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 > 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 > 左到右< / td > < / tr > < tr > < td > < strong > 9< / strong > < / td > < td > < code > ^< / code > < / td > < td > 按位异或< / td > < td > 左到右< / td > < / tr > < tr > < td > < strong > 10< / strong > < / td > < td > < code > |< / code > < / td > < td > 按位或< / td > < td > 左到右< / td > < / tr > < tr > < td > < strong > 11< / strong > < / td > < td > < code > & & < / code > < / td > < td > 逻辑与< / td > < td > 左到右< / td > < / tr > < tr > < td > < strong > 12< / strong > < / td > < td > < code > ||< / code > < / td > < td > 逻辑或< / td > < td > 左到右< / td > < / tr > < tr > < td > < strong > 13< / strong > < / td > < td > < code > ?:< / code > < / td > < td > 条件运算符< / td > < td > 右到左< / td > < / tr > < tr > < td > < strong > 14< / strong > < / td > < td > < code > =< / code > < / td > < td > 赋值运算符< / td > < td > 右到左< / td > < / tr > < tr > < td > < / td > < td > < code > /=< / code > < / td > < td > 除后赋值< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > *=< / code > < / td > < td > 乘后赋值< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > %=< / code > < / td > < td > 取模后赋值< / td > < td > < / td > < / tr > < tr > < td > < / td > < td > < code > +=
2024-07-22 08:45:31 +02:00
< script > window . _ _VP _HASH _MAP _ _ = JSON . parse ( "{\"index.md\":\"uFk6fSzW\",\"notes_01_c-basic_02_xdx_index.md\":\"Cxyt4HEd\",\"notes_index.md\":\"3bIiHjBr\",\"notes_01_c-basic_01_xdx_index.md\":\"DA3nuW_4\",\"notes_01_c-basic_03_xdx_index.md\":\"CgLUd3rz\",\"notes_01_c-basic_04_xdx_index.md\":\"CReYq6lg\"}" ) ; window . _ _VP _SITE _DATA _ _ = JSON . parse ( "{\"lang\":\"zh-CN\",\"dir\":\"ltr\",\"title\":\"许大仙\",\"titleTemplate\":\"Hi， ) ; < / script >
2024-07-16 05:05:03 +02:00
< / body >
< / html >
