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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;" > 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;" > 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;" > y < / 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 style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " x = < / 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;" > , x);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // x = 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;" > " y = < / 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;" > , y);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // y = 2< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 对 x 和 y 的值进行修改< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x< / 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:#24292E;--shiki-dark:#E1E4E8;" > y < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 2< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / 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 style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > x < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / 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 >
< 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;" > " x = < / 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;" > , x);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // x = 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;" > " y = < / 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;" > , y);< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // y = 6< / 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 > < / div > < / div > < h1 id = "第三章-分支结构-⭐" tabindex = "-1" > 第三章：分支结构（⭐） < a class = "header-anchor" href = "#第三章-分支结构-⭐" aria-label = "Permalink to "第三章：分支结构（⭐）"" > < / a > < / h1 > < h2 id = "_3-1-概述" tabindex = "-1" > 3.1 概述 < a class = "header-anchor" href = "#_3-1-概述" aria-label = "Permalink to "3.1 概述"" > < / a > < / h2 > < ul > < li > 根据特定条件执行不同的代码块，从而实现灵活的程序控制和更复杂的逻辑。< / li > < / ul > < h2 id = "_3-2-单分支结构" tabindex = "-1" > 3.2 单分支结构 < a class = "header-anchor" href = "#_3-2-单分支结构" aria-label = "Permalink to "3.2 单分支结构"" > < / a > < / h2 > < h3 id = "_3-2-1-概述" tabindex = "-1" > 3.2.1 概述 < a class = "header-anchor" href = "#_3-2-1-概述" aria-label = "Permalink to "3.2.1 概述"" > < / 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;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (条件表达式){< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句;< / 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 > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 在 C 语言中，严格意义上是没有 boolean 类型的，使用< code > 非0< / code > 表示< code > 真（ ） < / code > ， < code > 0< / code > 表示< code > 假（ ） < / code > 。< / li > < li > ② 当条件表达式为真（< code > 非0< / code > ），就会执行代码块中的语句；否则，就不会执行代码块中的语句。< / li > < / ul > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/3.DEoM0p3m.png" alt = "" > < / p > < h3 id = "_3-2-2-应用示例" tabindex = "-1" > 3.2.2 应用示例 < a class = "header-anchor" href = "#_3-2-2-应用示例" aria-label = "Permalink to "3.2.2 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：成年人心率的正常范围是每分钟 60~100 次。体检时，如果心率不在此范围内，则提示需要做进一步的检查。< / p > < / li > < li > < p > 示例：< / p > < / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" class = "copy" > < / button > < span class = "lang" > c< / span > < pre class = "shiki shiki-themes github-light github-dark vp-code" tabindex = "0" > < code > < span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdio.h> < / span > < / span >
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< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > main< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > () {< / span > < / span >
< 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;" > heartBeats < / 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;" > " 请输入您的心率：" < / 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;" > heartBeats);< / 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;" > (heartBeats < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 60< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ||< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > heartBeats < / 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;" > " 您的心率不在正常范围内，请做进一步的检查。< / 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 >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 体检结束！！！" < / 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;" > 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 = "_3-2-3-应用示例" tabindex = "-1" > 3.2.3 应用示例 < a class = "header-anchor" href = "#_3-2-3-应用示例" aria-label = "Permalink to "3.2.3 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：根据年龄判断，如果是未成年人，则提示 " 未成年人请在家长陪同下访问！" 。< / 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;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > age < / 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;" > " 请输入你的年龄：" < / 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;" > age);< / 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;" > (age < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 18< / 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;" > " 未成年人请在家长陪同下访问！< / 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 >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 欢迎继续访问！" < / 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;" > 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 > < h2 id = "_3-3-双分支结构" tabindex = "-1" > 3.3 双分支结构 < a class = "header-anchor" href = "#_3-3-双分支结构" aria-label = "Permalink to "3.3 双分支结构"" > < / a > < / h2 > < h3 id = "_3-3-1-概述" tabindex = "-1" > 3.3.1 概述 < a class = "header-anchor" href = "#_3-3-1-概述" aria-label = "Permalink to "3.3.1 概述"" > < / 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;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (条件表达式) { < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句块1;< / 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:#24292E;--shiki-dark:#E1E4E8;" > 语句块2;< / span > < / span >
2024-07-22 08:59:27 +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 > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 在 C 语言中，严格意义上是没有 boolean 类型的，使用< code > 非0< / code > 表示< code > 真（ ） < / code > ， < code > 0< / code > 表示< code > 假（ ） < / code > 。< / li > < li > ② 当条件表达式为真（< code > 非0< / code > ），就会执行代码块 1 中的语句；否则，执行代码块 2 中的语句。< / li > < / ul > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/4.DxEoA7Ht.png" alt = "" > < / p > < h3 id = "_3-3-2-应用示例" tabindex = "-1" > 3.3.2 应用示例 < a class = "header-anchor" href = "#_3-3-2-应用示例" aria-label = "Permalink to "3.3.2 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：判断一个整数，是奇数还是偶数。< / 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 >
2024-07-22 08:17:16 +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;" > num < / 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;" > " 请输入一个整数：" < / 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;" > num);< / 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;" > (num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 2< / 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;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 是偶数< / 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;" > , num);< / 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;" > 是奇数< / 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;" > , num);< / 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 > < / div > < / div > < h3 id = "_3-3-2-应用示例-1" tabindex = "-1" > 3.3.2 应用示例 < a class = "header-anchor" href = "#_3-3-2-应用示例-1" aria-label = "Permalink to "3.3.2 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求： ， ， " 你年龄大于18， " ；否则，输出 " 你的年龄不大这次放过你了。" < / 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;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > age < / 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;" > " 请输入年龄：" < / 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;" > age);< / 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;" > (age < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 18< / 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;" > " 你年龄大于18， < / 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;" > " 你的年龄不大，这次放过你了!< / 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 >
< 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 = "_3-3-3-应用示例" tabindex = "-1" > 3.3.3 应用示例 < a class = "header-anchor" href = "#_3-3-3-应用示例" aria-label = "Permalink to "3.3.3 应用示例"" > < / a > < / h3 > < ul > < li > 需求：判定某个年份是否为闰年？< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① year 是 400 的整倍数： year%400==0< / li > < li > ② 能被 4 整除，但不能被 100 整除： & & year % 100 != 0< / 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;" > year < / 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;" > " 请输入年份：" < / 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;" > year);< / 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;" > (year < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 400< / 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:#24292E;--shiki-dark:#E1E4E8;" > (year < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > %< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 4< / 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:#24292E;--shiki-dark:#E1E4E8;" > year < / 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;" > 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;" > " < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 是闰年< / 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;" > , year);< / 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;" > 不是闰年< / 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;" > , year);< / 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 > < / div > < / div > < h2 id = "_3-4-多重分支结构" tabindex = "-1" > 3.4 多重分支结构 < a class = "header-anchor" href = "#_3-4-多重分支结构" aria-label = "Permalink to "3.4 多重分支结构"" > < / a > < / h2 > < h3 id = "_3-4-1-概述" tabindex = "-1" > 3.4.1 概述 < a class = "header-anchor" href = "#_3-4-1-概述" aria-label = "Permalink to "3.4.1 概述"" > < / 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;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (条件表达式1) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句块1;< / 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;" > (条件表达式2) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句块2;< / span > < / span >
< span class = "line" > < 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:#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;" > (条件表达式n) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句块n;< / 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:#24292E;--shiki-dark:#E1E4E8;" > 语句块n< / 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 >
2024-07-22 08:59:27 +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 > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 在 C 语言中，严格意义上是没有 boolean 类型的，使用< code > 非0< / code > 表示< code > 真（ ） < / code > ， < code > 0< / code > 表示< code > 假（ ） < / code > 。< / li > < li > ② 首先判断关系表达式 1 的结果是真（值为 < code > 非0< / code > ）还是假（值为 < code > 0< / code > ） ： < ul > < li > 如果为真，就执行语句块 1， < / li > < li > 如果是假，就继续判断条件表达式 2， < / li > < li > 如果是真，就执行语句块 2， < / li > < li > 如果是假，就继续判断条件表达式…看其结果是真还是假。< / li > < li > ...< / li > < li > 如果没有任何关系表达式为真，就执行语句块 n+1， < / li > < / ul > < / li > < li > ③ 当条件表达式之间是< code > 互斥< / code > （彼此之间没有交集）关系时，条件判断语句及执行语句间顺序无所谓。< / li > < li > ④ 当条件表达式之间是< code > 包含< / code > 关系时，必须< code > 小上大下 / 子上父下< / code > ，否则范围小的条件表达式将不可能被执行。< / li > < li > ⑤ 当 if-else 结构是多选一的时候，最后的 else 是可选的，可以根据需要省略。< / li > < li > ⑥ 如果语句块中只有一条执行语句的时候，< code > {}< / code > 是可以省略的；但是，强烈建议保留！！！< / li > < / ul > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/5.DtY5Pf6u.png" alt = "image-20240722075241253" > < / p > < h3 id = "_3-4-1-应用示例" tabindex = "-1" > 3.4.1 应用示例 < a class = "header-anchor" href = "#_3-4-1-应用示例" aria-label = "Permalink to "3.4.1 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：张三参加考试，他和父亲达成协议，如果成绩不到 60 分没有任何奖励；如果成绩 60分（ ） ； < / 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 >
2024-07-22 08:17:16 +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;" > score < / 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;" > " 请输入分数：" < / 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;" > score);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 容错：分数不可能小于 0 或大于 100< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (score < / 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:#24292E;--shiki-dark:#E1E4E8;" > score < / 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;" > " 输入的分数有误！< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 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:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (score < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 90< / 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;" > " 奖励你一部华为 mate60 pro< / 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:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (score < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 80< / 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;" > " 奖励你一个 ipad< / 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:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (score < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 60< / 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;" > " 奖励你一个肉夹馍< / 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;" > " 你的成绩不及格，没有任何奖励！" < / 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 > < 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 > < h3 id = "_3-4-2-应用示例" tabindex = "-1" > 3.4.2 应用示例 < a class = "header-anchor" href = "#_3-4-2-应用示例" aria-label = "Permalink to "3.4.2 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：判断水的温度，如果大于 95℃， " 开水" ；如果大于 70℃ 且小于等于 95℃， " 热水" ；如果大于 40℃ 且小于等于 70℃， " 温水" ；如果小于等于 40℃， " 凉水" 。< / 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;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > temperature < / 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;" > " 请输入水的温度：" < / 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;" > temperature);< / 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;" > (temperature < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 95< / 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;" > " 开水 < / 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:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (temperature < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 70< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > temperature < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 95< / 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;" > " 热水 < / 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:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (temperature < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 40< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > temperature < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 70< / 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;" > " 温水 < / 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;" > " 凉水 < / 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 >
< 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 > < / div > < / div > < h2 id = "_3-5-多重分支结构-switch" tabindex = "-1" > 3.5 多重分支结构 switch < a class = "header-anchor" href = "#_3-5-多重分支结构-switch" aria-label = "Permalink to "3.5 多重分支结构 switch"" > < / a > < / h2 > < h3 id = "_3-5-1-概述" tabindex = "-1" > 3.5.1 概述 < a class = "header-anchor" href = "#_3-5-1-概述" aria-label = "Permalink to "3.5.1 概述"" > < / 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;" > switch< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (表达式){< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 常量值1: < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句块1;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > //break;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 常量值2: < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句块2;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > //break;< / span > < / span >
< span class = "line" > < 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:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 常量值n: < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句块n; < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > //break;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > [default: < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 语句块n< / 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:#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 > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① switch 后面表达式的值必须是一个整型（ < / li > < li > ② case 后面的值必须是常量，不能是变量。< / li > < li > ③ default 是可选的，当没有匹配的 case 的时候，就执行 default 。< / li > < li > ④ break 语句可以使程序跳出 switch 语句块，如果没有 break， < / li > < / ul > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/6.CButBugT.png" alt = "" > < / p > < h3 id = "_3-5-2-应用示例" tabindex = "-1" > 3.5.2 应用示例 < a class = "header-anchor" href = "#_3-5-2-应用示例" aria-label = "Permalink to "3.5.2 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求： ， ， ： ； ， ， < / 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;" > chs;< / 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;" > " 请输入一个字符（ ） ： " < / 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;" > %c< / 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;" > chs);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > switch< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (chs) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / 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;" > " 今天是星期一 < / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 窗前明月光 < / 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:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 今天是星期二 < / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 疑是地上霜 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' c' < / 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;" > " 今天是星期三 < / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 举头望明月 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > ' d' < / 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;" > " 今天是星期四 < / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 低头思故乡 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > default< / 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;" > " 输入错误！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / 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 > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < span class = "line-number" > 27< / span > < br > < span class = "line-number" > 28< / span > < br > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < span class = "line-number" > 31< / span > < br > < span class = "line-number" > 32< / span > < br > < / div > < / div > < h3 id = "_3-5-3-应用示例" tabindex = "-1" > 3.5.3 应用示例 < a class = "header-anchor" href = "#_3-5-3-应用示例" aria-label = "Permalink to "3.5.3 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求： ， ， ： ， ， < / 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;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > month;< / 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;" > " 请输入月份 (1-12)： " < / 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;" > month);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > switch< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (month) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / 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;" > case< / 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:#D73A49;--shiki-dark:#F97583;" > case< / 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;" > case< / 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / 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;" > case< / 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;" > case< / 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:#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;" > 月有 31 天< / 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;" > , month);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 4< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > :< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 6< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > :< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 9< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > :< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 11< / 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;" > 月有 30 天< / 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;" > , month);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / 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 style = "--shiki-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;" > 月有 28 天或 29 天< / 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;" > , month);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > default< / 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;" > " 输入错误！" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / 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 > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < span class = "line-number" > 27< / span > < br > < span class = "line-number" > 28< / span > < br > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < span class = "line-number" > 31< / span > < br > < span class = "line-number" > 32< / span > < br > < span class = "line-number" > 33< / span > < br > < span class = "line-number" > 34< / span > < br > < / div > < / div > < h3 id = "_3-5-4-switch-和-if-else-if-的比较" tabindex = "-1" > 3.5.4 switch 和 if else if 的比较 < a class = "header-anchor" href = "#_3-5-4-switch-和-if-else-if-的比较" aria-label = "Permalink to "3.5.4 switch 和 if else if 的比较"" > < / a > < / h3 > < ul > < li > ① 如果判断条件是判等，而且符合整型、枚举类型，虽然两个语句都可以使用，建议使用 swtich 语句。< / li > < li > ② 如果判断条件是区间判断，大小判断等，使用 if...else...if。< / li > < / ul > < h2 id = "_3-6-嵌套分支" tabindex = "-1" > 3.6 嵌套分支 < a class = "header-anchor" href = "#_3-6-嵌套分支" aria-label = "Permalink to "3.6 嵌套分支"" > < / a > < / h2 > < h3 id = "_3-6-1-概述" tabindex = "-1" > 3.6.1 概述 < a class = "header-anchor" href = "#_3-6-1-概述" aria-label = "Permalink to "3.6.1 概述"" > < / a > < / h3 > < ul > < li > 嵌套分支是指，在一个分支结构中又嵌套了另一个分支结构，里面的分支的结构称为内层分支，外面的分支结构称为外层分支。< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 嵌套分支层数不宜过多，建议最多不要超过 3 层。< / p > < / div > < h3 id = "_3-6-2-应用示例" tabindex = "-1" > 3.6.2 应用示例 < a class = "header-anchor" href = "#_3-6-2-应用示例" aria-label = "Permalink to "3.6.2 应用示例"" > < / a > < / h3 > < ul > < li > 需求：根据淡旺季的月份和年龄，打印票价。< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 4 -10 是旺季： < ul > < li > 成人（ ） ： < / li > < li > 儿童（< 18） ： < / li > < li > 老人（> 60） ： < / li > < / ul > < / li > < li > ② 其余是淡季： < ul > < li > 成人： < / li > < li > 其他： < / 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 >
< 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;" > month;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > age;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > price < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 60< / 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;" > " 请输入月份 (1-12)： " < / 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;" > month);< / 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;" > " 请输入年龄：" < / 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;" > age);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 旺季< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (month < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 4< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > & & < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > month < / 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;" > (age < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 18< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > price < / 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 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;" > (age < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 60< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > price < / 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;" > }< / 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:#D73A49;--shiki-dark:#F97583;" > if< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (age < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 18< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > price < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 40< / 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:#24292E;--shiki-dark:#E1E4E8;" > price < / 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:#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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 票价: < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2lf\n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , price);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-06 10:29:35 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < span class = "line-number" > 27< / span > < br > < span class = "line-number" > 28< / span > < br > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < span class = "line-number" > 31< / span > < br > < span class = "line-number" > 32< / span > < br > < span class = "line-number" > 33< / span > < br > < / div > < / div > < h1 id = "第四章-随机数" tabindex = "-1" > 第四章：随机数 < a class = "header-anchor" href = "#第四章-随机数" aria-label = "Permalink to "第四章：随机数"" > < / a > < / h1 > < h2 id = "_4-1-概述" tabindex = "-1" > 4.1 概述 < a class = "header-anchor" href = "#_4-1-概述" aria-label = "Permalink to "4.1 概述"" > < / a > < / h2 > < ul > < li > 所谓的随机数就是没有规则，并且不能预测的一些数字，也称为真随机数。< / li > < li > 程序中也是可以产生随机数的，但是是通过一些固定规则产生的，称为伪随机数。< / li > < li > 常见的伪随机数（ ， ） ， ： < / li > < / ul > < p > $ X_{n+1} = (a \cdot X_n + b) \mod m $< / p > < ul > < li > 其中， ， ） ， ） ， ） ） < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 假设 a = 31 ， ， < code > X_{n+1} = (31 × < / code > 。< / p > < ul > < li > 如果 < code > X_{n}< / code > = 1 ，那么 < code > X_{n+1}< / code > = 44 。< / li > < li > 如果 < code > X_{n}< / code > = 44 ，那么 < code > X_{n+1}< / code > = 77 。< / li > < li > 如果 < code > X_{n}< / code > = 77 ，那么 < code > X_{n+1}< / code > = 0 。< / li > < li > ...< / li > < / ul > < p > 最后，将得到 44、77、0、13、16、9 、92、65、28 ... ，其中 1 也称为初始种子（随机数种子）。< / p > < / div > < ul > < li > 工作原理： < ul > < li > ① 设置初始种子（ ） ： < ul > < li > 种子值是算法生成随机数序列的起点。< / li > < li > 不同的种子值会产生不同的随机数序列。< / li > < / ul > < / li > < li > ② 递归生成随机数： < ul > < li > 从初始种子开始，通过公式不断生成新的随机数。< / li > < li > 每次迭代都使用前一次生成的随机数作为输入。< / li > < / ul > < / li > < / ul > < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 如果种子的值相同，那么每次生成的随机数将相同，解决方案就是将种子的值设置为当前的时间戳。< / p > < / div > < h2 id = "_4-2-c-语言中随机数的产生" tabindex = "-1" > 4.2 C 语言中随机数的产生 < a class = "header-anchor" href = "#_4-2-c-语言中随机数的产生" aria-label = "Permalink to "4.2 C 语言中随机数的产生"" > < / a > < / h2 > < ul > < li > ① 设置随机数种子：< / li > < / ul > < div class = "language-c vp-adaptive-theme line-numbers-mode" > < button title = "Copy Code" c
2024-07-22 08:17:16 +02:00
< 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:#6F42C1;--shiki-dark:#B392F0;" > rand< / 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 > < / div > < / div > < ul > < li > ③ 产生一个指定范围内的随机数：< / 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:#6F42C1;--shiki-dark:#B392F0;" > random_in_range< / 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;" > min< / 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;" > max< / 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:#6F42C1;--shiki-dark:#B392F0;" > rand< / 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;" > (max < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > min;< / 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 > < / 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < stdlib.h> < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > #include< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > < time.h> < / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 生成指定范围的随机数的函数< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > randomInRange< / 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;" > min< / 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;" > max< / 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:#6F42C1;--shiki-dark:#B392F0;" > rand< / 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;" > (max < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > min;< / 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:#6A737D;--shiki-dark:#6A737D;" > // 使用当前时间作为种子< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > srand< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > time< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / 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:#6A737D;--shiki-dark:#6A737D;" > // 定义范围< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 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:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > max < / 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:#6A737D;--shiki-dark:#6A737D;" > // 生成并打印随机数< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > 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:#005CC5;--shiki-dark:#79B8FF;" > 10< / 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;" > i) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > random < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > randomInRange< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (min, 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;" > " < / 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;" > , random);< / 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 > < 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 > < h1 id = "第五章-循环结构-⭐" tabindex = "-1" > 第五章：循环结构（⭐） < a class = "header-anchor" href = "#第五章-循环结构-⭐" aria-label = "Permalink to "第五章：循环结构（⭐）"" > < / a > < / h1 > < h2 id = "_5-1-概述" tabindex = "-1" > 5.1 概述 < a class = "header-anchor" href = "#_5-1-概述" aria-label = "Permalink to "5.1 概述"" > < / a > < / h2 > < ul > < li > 循环结构：在某些条件满足的情况下，反复执行特定代码的功能。< / li > < / ul > < h2 id = "_5-2-for-循环" tabindex = "-1" > 5.2 for 循环 < a class = "header-anchor" href = "#_5-2-for-循环" aria-label = "Permalink to "5.2 for 循环"" > < / a > < / h2 > < h3 id = "_5-2-1-概述" tabindex = "-1" > 5.2.1 概述 < a class = "header-anchor" href = "#_5-2-1-概述" aria-label = "Permalink to "5.2.1 概述"" > < / 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;" > for< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (初始化条件①;循环条件表达式②;迭代语句④){< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 循环体语句③< / 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 > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 初始化条件，用于初始化循环变量，只会执行一次，且循环开始前就执行（可以声明多个变量，但是必须是同一类型，用逗号 < code > ,< / code > 隔开）。< / li > < li > ② 循环条件表达式每次循环都执行，同 while 循环一样，每次先判断后执行循环体语句。< / li > < li > ③ 迭代语句每次循环都执行，在大括号中循环体语句之后执行（如果有多个变量更新，用逗号 < code > ,< / code > 隔开）。< / li > < / ul > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/7.DG_I9X5w.png" alt = "" > < / p > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 执行过程是：① --> ② --> ③ --> ④ --> ② --> ③ --> ④ --> ... --> ② 。< / p > < / div > < h3 id = "_5-2-2-应用示例" tabindex = "-1" > 5.2.2 应用示例 < a class = "header-anchor" href = "#_5-2-2-应用示例" aria-label = "Permalink to "5.2.2 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：输出 5 行 < code > Hello World!< / 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 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;" > for< / 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;" > 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;" > ; i < / 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i) {< / 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;" > " Hello World!< / 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 >
< 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 = "_5-2-3-应用示例" tabindex = "-1" > 5.2.3 应用示例 < a class = "header-anchor" href = "#_5-2-3-应用示例" aria-label = "Permalink to "5.2.3 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：求 1 ~ 100 之内所有偶数的和，以及偶数的个数。< / 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;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > sum < / 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;" > count < / 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:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > 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;" > ; i < / 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;" > ; i< / 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;" > 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:#005CC5;--shiki-dark:#79B8FF;" > 2< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ==< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > sum < / 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 style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > count< / 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:#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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 1 ~ 100 中的所有偶数的和为: < / 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;" > , sum);< / 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;" > " 1 ~ 100 中的所有偶数的个数为: < / 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;" > , count);< / 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 >
2024-07-23 01:41:46 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < / div > < / div > < h3 id = "_5-2-4-应用示例" tabindex = "-1" > 5.2.4 应用示例 < a class = "header-anchor" href = "#_5-2-4-应用示例" aria-label = "Permalink to "5.2.4 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：输出所有的水仙花数，所谓水仙花数是指一个 3 位数，其各个位上数字立方和等于其本身，例如：< code > 153 = 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 >
2024-07-22 08:17:16 +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;" > count < / 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:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > i < / 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;" > ; i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 999< / 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;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 获取三位数< / 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;" > i < / 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;" > shi < / 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;" > 10< / 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;" > bai < / 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;" > 100< / 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;" > // 判定是否为水仙花数< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / 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;" > ge < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / 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;" > shi < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / 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;" > shi < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +< / 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;" > bai < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / 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;" > i) {< / 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;" > " 水仙花数：< / 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 >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > count< / 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:#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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 水仙花数总个数：< / 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;" > , count);< / 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 > < / div > < / div > < h3 id = "_5-2-5-应用示例" tabindex = "-1" > 5.2.5 应用示例 < a class = "header-anchor" href = "#_5-2-5-应用示例" aria-label = "Permalink to "5.2.5 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：将 1 ~ 10 倒序输出， ： < / 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;" > for< / 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;" > i < / 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;" > ; 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;" > ) {< / 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:#24292E;--shiki-dark:#E1E4E8;" > , i);< / 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 > < / div > < / div > < h3 id = "_5-2-6-应用示例" tabindex = "-1" > 5.2.6 应用示例 < a class = "header-anchor" href = "#_5-2-6-应用示例" aria-label = "Permalink to "5.2.6 应用示例"" > < / a > < / h3 > < ul > < li > 需求：输入两个正整数 m 和 n ， ， ： < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > 如果数 a 能被数 b 整除，且结果是整数，那么 a 就叫做 b 的倍数， < / li > < li > 如果一个整数同时是几个整数的约数，则称该整数为这些整数的公约数；其中，数值最大的称为最大公约数。< / li > < li > 如果一个整数同时为两个或多个整数的倍数的数，则称该整数为这些整数的公倍数；其中，数值最小的称为最小公倍数。< / 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 >
< 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;" > 12< / 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 >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 取出两个数中的较小值< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > min < / 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 >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > min; 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;" > ; i< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > --< / 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;" > if< / 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;" > 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:#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;" > 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 最大公约数是：< / 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;" > // 公约数< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > //跳出当前循环结构< / span > < / span >
< span class = "line" > < 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:#6A737D;--shiki-dark:#6A737D;" > // 取出两个数中的较大值< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > max < / 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:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > max; i < / 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; i< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / 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;" > 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;" > m < / 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:#24292E;--shiki-dark:#E1E4E8;" > i < / 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:#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;" > " 最小公倍数是：< / 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;" > // 公倍数< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / 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:#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 > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < span class = "line-number" > 27< / span > < br > < span class = "line-number" > 28< / span > < br > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < span class = "line-number" > 31< / span > < br > < span class = "line-number" > 32< / span > < br > < / div > < / div > < h2 id = "_5-3-while-循环" tabindex = "-1" > 5.3 while 循环 < a class = "header-anchor" href = "#_5-3-while-循环" aria-label = "Permalink to "5.3 while 循环"" > < / a > < / h2 > < h3 id = "_5-3-1-概述" tabindex = "-1" > 5.3.1 概述 < a class = "header-anchor" href = "#_5-3-1-概述" aria-label = "Permalink to "5.3.1 概述"" > < / 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:#24292E;--shiki-dark:#E1E4E8;" > 初始化条件①；< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > while< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (循环条件语句②) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 循环体语句③；< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 迭代语句④；< / span > < / span >
2024-07-22 08:59:27 +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 > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① < code > while(循环条件部分)< / code > 中循环条件为< code > 非0< / code > 值，表示 < code > true< / code > 、< code > 真< / code > ；为< code > 0< / code > 值，表示 < code > false< / code > 、< code > 假< / code > 。< / li > < li > ② 当循环条件表达式成立，就执行循环体语句，直到条件不成立停止循环。< / li > < li > ③ 为避免死循环，循环条件表达式不能永远成立，且随着循环次数增加，应该越来越趋向于不成立。< / li > < li > ④ for 循环和 while 循环< code > 可以相互转换< / code > ，二者没有性能上的差别。< / li > < li > ⑤ for 循环与 while 循环的区别：< code > 初始化条件部分的作用域不同< / code > 。< / li > < / ul > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/8.Cw8LCRHN.png" alt = "" > < / p > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 执行过程是：① --> ② --> ③ --> ④ --> ② --> ③ --> ④ --> ... --> ② 。< / p > < / div > < h3 id = "_5-3-2-应用示例" tabindex = "-1" > 5.3.2 应用示例 < a class = "header-anchor" href = "#_5-3-2-应用示例" aria-label = "Permalink to "5.3.2 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：输出 5 行 < code > Hello World!< / 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 >
2024-07-22 08:17:16 +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;" > 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;" > while< / 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;" > 5< / 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;" > " Hello World!< / 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;" > i< / 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:#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 > < / div > < / div > < h3 id = "_5-3-3-应用示例" tabindex = "-1" > 5.3.3 应用示例 < a class = "header-anchor" href = "#_5-3-3-应用示例" aria-label = "Permalink to "5.3.3 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：求 1 ~ 100 之内所有偶数的和，以及偶数的个数。< / 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;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > sum < / 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;" > count < / 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:#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;" > while< / 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;" > 100< / 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:#005CC5;--shiki-dark:#79B8FF;" > 2< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ==< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > sum < / 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 style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > count< / 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:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / 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;" > ;< / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 1 ~ 100 中的所有偶数的和为: < / 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;" > , sum);< / 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;" > " 1 ~ 100 中的所有偶数的个数为: < / 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;" > , count);< / 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 = "_5-3-4-应用示例" tabindex = "-1" > 5.3.4 应用示例 < a class = "header-anchor" href = "#_5-3-4-应用示例" aria-label = "Permalink to "5.3.4 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：世界最高山峰是珠穆朗玛峰，它的高度是 8848.86 米，假如我有一张足够大的纸，它的厚度是 0.1 毫米。请问，我折叠多少次，可以折成珠穆朗玛峰的高度?< / 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:#6A737D;--shiki-dark:#6A737D;" > // 折叠的次数< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > count < / 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:#6A737D;--shiki-dark:#6A737D;" > // 珠峰的高度< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > zfHeight < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 8848860< / 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;" > // 每次折叠的高度< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > paperHeight < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0.1< / 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;" > while< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (paperHeight < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > zfHeight) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > count< / 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:#24292E;--shiki-dark:#E1E4E8;" > paperHeight < / 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 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;" > " 需要折叠 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %d< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 次，才能得到珠峰的高度。< / 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;" > , count);< / 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;" > " 折纸的高度为 < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > %.2f< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 米，超过了珠峰的高度" < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , paperHeight < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > /< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1000< / 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;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-06 07:54:49 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < / div > < / div > < h3 id = "_5-3-5-应用示例" tabindex = "-1" > 5.3.5 应用示例 < a class = "header-anchor" href = "#_5-3-5-应用示例" aria-label = "Permalink to "5.3.5 应用示例"" > < / a > < / h3 > < ul > < li > 需求：给出一个整数 n ，判断该整数是否是 2 的幂次方。如果是，就输出 yes ；否则，输出 no 。< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 思路：< / p > < ul > < li > ① 2^ 0 = 1 ， ， ， ， ， < / li > < li > ② 循环终止条件： < ul > < li > 结果是 1 的时候，就可以结束，输出 yes 。< / li > < li > 如果在除以 2 的时候，无法被 2 整数，也可以结束，输出 no ，如： 100 / 2 = 50， < / 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 >
< 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;" > // 禁用 stdout 缓冲区< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > setbuf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (stdout, < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > NULL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > 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;" > 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;" > " 请输入一个整数：" < / 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;" > n);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > while< / 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;" > 1< / 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:#005CC5;--shiki-dark:#79B8FF;" > 2< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ==< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > n < / 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 style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / 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;" > (n < / 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;" > " yes" < / 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;" > " no" < / 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 > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < / div > < / div > < h3 id = "_5-3-6-应用示例" tabindex = "-1" > 5.3.6 应用示例 < a class = "header-anchor" href = "#_5-3-6-应用示例" aria-label = "Permalink to "5.3.6 应用示例"" > < / a > < / h3 > < ul > < li > 需求： ， ： > 321 。< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 思路：从右边开始，依次获取每一位数字，再拼接起来。< / 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;" > // 禁用 stdout 缓冲区< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > setbuf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (stdout, < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > NULL< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > 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;" > 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;" > original < / 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;" > rev < / 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;" > " 请输入一个整数：" < / 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;" > num);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > original < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num;< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 从右边开始，依次获取每个数字，然后拼接到 rev 中< / span > < / 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;" > * 第 1 次， ， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > * 第 2 次， ， < / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > * 第 3 次， ， < / span > < / 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;" > // 循环结束的条件是 num == 0< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > while< / 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;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 获取 num 右边的第一位数字< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > temp < / span > < span style = "--shiki-light:#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:#6A737D;--shiki-dark:#6A737D;" > // 去掉最后一位数字< / span > < / span >
< span class = "line" > < 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:#6A737D;--shiki-dark:#6A737D;" > // 将 temp 拼接到 rev 的后面< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > rev < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > rev < / 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:#24292E;--shiki-dark:#E1E4E8;" > temp;< / 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:#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;" > 的反转是 < / 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;" > , original, rev);< / 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 > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < span class = "line-number" > 31< / span > < br > < span class = "line-number" > 32< / span > < br > < span class = "line-number" > 33< / span > < br > < span class = "line-number" > 34< / span > < br > < / div > < / div > < h2 id = "_5-4-do-while-循环" tabindex = "-1" > 5.4 do-while 循环 < a class = "header-anchor" href = "#_5-4-do-while-循环" aria-label = "Permalink to "5.4 do-while 循环"" > < / a > < / h2 > < h3 id = "_5-4-1-概述" tabindex = "-1" > 5.4.1 概述 < a class = "header-anchor" href = "#_5-4-1-概述" aria-label = "Permalink to "5.4.1 概述"" > < / 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:#24292E;--shiki-dark:#E1E4E8;" > ①初始化部分;< / span > < / span >
2024-07-22 08:17:16 +02:00
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > do< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ③循环体部分< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ④迭代部分< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > while< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (②循环条件部分);< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① < code > do{} while();< / code > 最后有一个分号。< / li > < li > ② do-while 结构的循环体语句是至少会执行一次，这个和 for 、while 是不一样的。< / li > < li > ③ 循环的三个结构 for、while、do-while 三者是可以相互转换的。< / li > < / ul > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/9.TqkSPw2X.png" alt = "" > < / p > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 执行过程是：① --> ③ --> ④ --> ② --> ③ --> ④ --> ② --> ... --> ② 。< / p > < / div > < h3 id = "_5-4-2-应用示例" tabindex = "-1" > 5.4.2 应用示例 < a class = "header-anchor" href = "#_5-4-2-应用示例" aria-label = "Permalink to "5.4.2 应用示例"" > < / a > < / h3 > < ul > < li > 需求：求 1 ~ 100 之内所有偶数的和，以及偶数的个数。< / 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;" > sum < / 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;" > count < / 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:#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;" > do< / 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:#005CC5;--shiki-dark:#79B8FF;" > 2< / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ==< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > sum < / 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 style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > count< / 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:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / 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;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > while< / 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;" > 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;" > " 1 ~ 100 中的所有偶数的和为: < / 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;" > , sum);< / 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;" > " 1 ~ 100 中的所有偶数的个数为: < / 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;" > , count);< / 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 = "_5-4-3-应用示例" tabindex = "-1" > 5.4.3 应用示例 < a class = "header-anchor" href = "#_5-4-3-应用示例" aria-label = "Permalink to "5.4.3 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：实现 ATM 取款机功能。< / 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:#6A737D;--shiki-dark:#6A737D;" > // 账户余额< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > balance < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0.0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 客户选择< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > selection;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 存款金额< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > addMoney;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 取款金额< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > double< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > minusMoney;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 退出标识< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > bool< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > exitFlag < / 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:#D73A49;--shiki-dark:#F97583;" > do< / 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;" > " =========ATM========< / 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:#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;" > \t< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 1、存款< / 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:#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;" > \t< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 2、取款< / 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:#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;" > \t< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 3、显示余额< / 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:#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;" > \t< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > 4、退出< / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 请选择(1-4)： " < / 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;" > 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;" > selection);< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > switch< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (selection) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / 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;" > " 您当前的余额是: < / 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;" > , balance);< / 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;" > " 请输入存款金额：" < / 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;" > %lf< / 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:#E36209;--shiki-dark:#FFAB70;" > addMoney< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > balance < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > +=< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > addMoney;< / 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;" > " 存款成功，您当前的余额是：< / 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;" > , balance);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / 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 style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 您当前的余额是: < / 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;" > , balance);< / 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;" > " 请输入取款金额：" < / 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;" > %lf< / 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:#E36209;--shiki-dark:#FFAB70;" > minusMoney< / 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;" > (minusMoney < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > > < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > balance) {< / 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;" > " 余额不足，取款失败。< / 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:#24292E;--shiki-dark:#E1E4E8;" > balance < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > -=< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > minusMoney;< / 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;" > " 取款成功，您的余额为：< / 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;" > , balance);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / 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;" > " 您的账户余额为：< / 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;" > , balance);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > case< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 4< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > :< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > exitFlag < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > true< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 欢迎下次再来。< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > default< / 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;" > " 输入有误，请重新输入。< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / 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:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > while< / 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;" > exitFlag);< / 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 > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < span class = "line-number" > 31< / span > < br > < span class = "line-number" > 32< / span > < br > < span class = "line-number" > 33< / span > < br > < span class = "line-number" > 34< / span > < br > < span class = "line-number" > 35< / span > < br > < span class = "line-number" > 36< / span > < br > < span class = "line-number" > 37< / span > < br > < span class = "line-number" > 38< / span > < br > < span class = "line-number" > 39< / span > < br > < span class = "line-number" > 40< / span > < br > < span class = "line-number" > 41< / span > < br > < span class = "line-number" > 42< / span > < br > < span class = "line-number" > 43< / span > < br > < span class = "line-number" > 44< / span > < br > < span class = "line-number" > 45< / span > < br > < span class = "line-number" > 46< / span > < br > < span class = "line-number" > 47< / span > < br > < span class = "line-number" > 48< / span > < br > < span class = "line-number" > 49< / span > < br > < span class = "line-number" > 50< / span > < br > < span class = "line-number" > 51< / span > < br > < span class = "line-number" > 52< / span > < br > < span class = "line-number" > 53< / span > < br > < span class = "line-number" > 54< / span > < br > < span class = "line-number" > 55< / span > < br > < span class = "line-number" > 56< / span > < br > < span class = "line-number" > 57< / span > < br > < span class = "line-number" > 58< / span > < br > < / div > < / div > < h2 id = "_5-5-嵌套循环" tabindex = "-1" > 5.5 嵌套循环 < a class = "header-anchor" href = "#_5-5-嵌套循环" aria-label = "Permalink to "5.5 嵌套循环"" > < / a > < / h2 > < h3 id = "_5-5-1-概述" tabindex = "-1" > 5.5.1 概述 < a class = "header-anchor" href = "#_5-5-1-概述" aria-label = "Permalink to "5.5.1 概述"" > < / a > < / h3 > < ul > < li > 所谓的嵌套循环，是指一个循环结构 A 的循环体是另一个循环结构 B 。例如： < / 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:#D73A49;--shiki-dark:#F97583;" > for< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (初始化语句①; 循环条件语句②; 迭代语句⑦) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (初始化语句③; 循环条件语句④; 迭代语句⑥) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > 循环体语句⑤;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
2024-07-23 04:32:11 +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 > < / div > < / div > < ul > < li > 其中， < ul > < li > 外层循环：循环结构 A< / li > < li > 内层循环：循环结构 B< / li > < / ul > < / li > < / ul > < p > < img src = "/c/assets/10.DJkVOkw7.png" alt = "" > < / p > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 实际上，嵌套循环就是将内层循环当成外层循环的循环体。当只有内层循环的循环条件为 false ，才会完全跳出内层循环，才可结束外层的当次循环，开始下一次循环。< / li > < li > ② 假设外层循环次数为 m 次，内层循环次数为 n 次，则内层循环体实际上需要执行 m × < / li > < li > ③ 从二维图形的角度看，外层循环控制< code > 行数< / code > ，内层循环控制< code > 列数< / code > 。< / li > < li > ④ 实际开发中，我们最多见到的嵌套循环是两层，一般不会出现超过三层的嵌套循环。如果将要出现，一定要停下来重新梳理业务逻辑，重新思考算法的实现，控制在三层以内；否则，可读性会很差。< / li > < / ul > < / div > < h3 id = "_5-5-2-应用示例" tabindex = "-1" > 5.5.2 应用示例 < a class = "header-anchor" href = "#_5-5-2-应用示例" aria-label = "Permalink to "5.5.2 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：打印 5 行 < code > *< / code > ，要求每行 6 个 < code > *< / 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 >
2024-07-22 08:17:16 +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;" > for< / 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;" > 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;" > ; i < / 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > j < / 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;" > 6< / 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;" > j) {< / 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:#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;" > \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 >
< 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 > < h3 id = "_5-5-3-应用示例" tabindex = "-1" > 5.5.3 应用示例 < a class = "header-anchor" href = "#_5-5-3-应用示例" aria-label = "Permalink to "5.5.3 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：打印 5 行直角三角形。< / 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;" > for< / 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;" > 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;" > ; i < / 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > j < / 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:#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 >
< span class = "line" > < span style = "--shiki-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:#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;" > \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 >
< 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 > < h3 id = "_5-5-4-应用示例" tabindex = "-1" > 5.5.4 应用示例 < a class = "header-anchor" href = "#_5-5-4-应用示例" aria-label = "Permalink to "5.5.4 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：打印 5 行倒直角三角形。< / 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;" > for< / 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;" > 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;" > ; i < / 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > ++< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > i) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > j < / 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;" > 6< / 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:#24292E;--shiki-dark:#E1E4E8;" > j) {< / 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:#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;" > \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 >
< 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 > < h3 id = "_5-5-5-应用示例" tabindex = "-1" > 5.5.5 应用示例 < a class = "header-anchor" href = "#_5-5-5-应用示例" aria-label = "Permalink to "5.5.5 应用示例"" > < / a > < / h3 > < ul > < li > < p > 需求：打印 9 < code > × < / code > 9 乘法表。< / 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;" > for< / 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;" > 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;" > ; i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 9< / 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;" > i) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > j < / 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:#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 >
< span class = "line" > < span style = "--shiki-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< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i, j, i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > *< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > j);< / 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;" > \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 >
< 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 > < h2 id = "_5-6-无限循环" tabindex = "-1" > 5.6 无限循环 < a class = "header-anchor" href = "#_5-6-无限循环" aria-label = "Permalink to "5.6 无限循环"" > < / a > < / h2 > < 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;" > while< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 1< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ){< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ...< / span > < / span >
< 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 > < / 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;" > for< / 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:#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 > < / div > < / div > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < ul > < li > ① 在开发中， ， ， （ ） < / li > < li > ② 如果上述的循环结构不能终止，就会构成死循环；所以，在实际开发中，要避免出现死循环！！！< / li > < / ul > < / div > < ul > < li > 示例：从键盘读入个数不确定的整数，并判断读入的正数和负数的个数，输入为 0 时结束程序< / 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;" > // 记录输入的整数< / span > < / 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;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 记录正数个数< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > positiveCount < / 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:#6A737D;--shiki-dark:#6A737D;" > // 记录负数个数< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > int< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > negativeCount < / 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:#D73A49;--shiki-dark:#F97583;" > while< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > true< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 请输入一个整数：" < / 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;" > num);< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > if< / 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;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > positiveCount< / 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:#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;" > (num < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < < / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > negativeCount< / 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:#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;" > " 程序结束！< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / 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:#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;" > " 正数的个数：< / 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;" > , positiveCount);< / 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;" > " 负数的个数：< / 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;" > , negativeCount);< / 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 >
2024-07-23 04:32:11 +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 > < / div > < / div > < h2 id = "_5-7-跳转控制语句" tabindex = "-1" > 5.7 跳转控制语句 < a class = "header-anchor" href = "#_5-7-跳转控制语句" aria-label = "Permalink to "5.7 跳转控制语句"" > < / a > < / h2 > < h3 id = "_5-7-1-break" tabindex = "-1" > 5.7.1 break < a class = "header-anchor" href = "#_5-7-1-break" aria-label = "Permalink to "5.7.1 break"" > < / a > < / h3 > < ul > < li > break 的使用场景： ， < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > break 一旦执行，就结束(或跳出)当前循环结构；并且，此关键字的后面，不能声明其它语句。< / p > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/11.Bkdbe2NL.png" alt = "" > < / p > < ul > < li > 示例：打印 0 ~ 10 ，如果遇到 < code > 3< / code > ，就停止打印< / 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 >
2024-07-22 08:17:16 +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;" > for< / 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;" > 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:#005CC5;--shiki-dark:#79B8FF;" > 10< / 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;" > i) {< / 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:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > break< / 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;" > , i);< / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 程序结束！< / 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 >
< 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：编写程序，要求输入一个数字，判断该数字是否是质数< / 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;" > bool< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > isFlag < / 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:#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;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > do< / 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;" > " 请输入一个整数（必须大于 1 ） ： " < / 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;" > num);< / 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;" > (num < / 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;" > " 输入的数字不是合法，请重新输入！！！< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > \n< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > );< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > isFlag < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > true< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > else< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > isFlag < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > false< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span >
< span class = "line" > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > } < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > while< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (isFlag);< / 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;" > isPrime < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > =< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > true< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > i < / 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;" > ; i < / span > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > < < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > num; i< / 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;" > if< / 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;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > isPrime < / 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:#D73A49;--shiki-dark:#F97583;" > break< / 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:#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;" > (isPrime) {< / 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;" > 是一个质数< / 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;" > , num);< / 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;" > 不是一个质数< / 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;" > , num);< / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 程序结束！< / 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 >
< 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 >
2024-07-23 04:32:11 +02:00
< span class = "line" > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > }< / span > < / span > < / code > < / pre > < div class = "line-numbers-wrapper" aria-hidden = "true" > < span class = "line-number" > 1< / span > < br > < span class = "line-number" > 2< / span > < br > < span class = "line-number" > 3< / span > < br > < span class = "line-number" > 4< / span > < br > < span class = "line-number" > 5< / span > < br > < span class = "line-number" > 6< / span > < br > < span class = "line-number" > 7< / span > < br > < span class = "line-number" > 8< / span > < br > < span class = "line-number" > 9< / span > < br > < span class = "line-number" > 10< / span > < br > < span class = "line-number" > 11< / span > < br > < span class = "line-number" > 12< / span > < br > < span class = "line-number" > 13< / span > < br > < span class = "line-number" > 14< / span > < br > < span class = "line-number" > 15< / span > < br > < span class = "line-number" > 16< / span > < br > < span class = "line-number" > 17< / span > < br > < span class = "line-number" > 18< / span > < br > < span class = "line-number" > 19< / span > < br > < span class = "line-number" > 20< / span > < br > < span class = "line-number" > 21< / span > < br > < span class = "line-number" > 22< / span > < br > < span class = "line-number" > 23< / span > < br > < span class = "line-number" > 24< / span > < br > < span class = "line-number" > 25< / span > < br > < span class = "line-number" > 26< / span > < br > < span class = "line-number" > 27< / span > < br > < span class = "line-number" > 28< / span > < br > < span class = "line-number" > 29< / span > < br > < span class = "line-number" > 30< / span > < br > < span class = "line-number" > 31< / span > < br > < span class = "line-number" > 32< / span > < br > < span class = "line-number" > 33< / span > < br > < span class = "line-number" > 34< / span > < br > < span class = "line-number" > 35< / span > < br > < span class = "line-number" > 36< / span > < br > < span class = "line-number" > 37< / span > < br > < / div > < / div > < h3 id = "_5-7-2-continue" tabindex = "-1" > 5.7.2 continue < a class = "header-anchor" href = "#_5-7-2-continue" aria-label = "Permalink to "5.7.2 continue"" > < / a > < / h3 > < ul > < li > continue 的使用场景： < / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > continue 一旦执行，就结束(或跳出)当次循环结构；并且，此关键字的后面，不能声明其它语句。< / p > < / div > < ul > < li > 流程图，如下所示：< / li > < / ul > < p > < img src = "/c/assets/12.D2yeCvfw.png" alt = "" > < / p > < ul > < li > 示例：打印 0 ~ 10 ，如果遇到 < code > 3< / code > ，就继续下一次打印< / 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 >
2024-07-22 08:17:16 +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;" > for< / 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;" > 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:#005CC5;--shiki-dark:#79B8FF;" > 10< / 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;" > i) {< / 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:#005CC5;--shiki-dark:#79B8FF;" > 3< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ) {< / span > < / span >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > continue< / 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;" > , i);< / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 程序结束！< / 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 >
< 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：输出 100 以内（包括 100） ， < / 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;" > for< / 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;" > 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;" > ; i < / 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;" > ; i< / 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;" > 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:#005CC5;--shiki-dark:#79B8FF;" > 7< / 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:#24292E;--shiki-dark:#E1E4E8;" > i < / 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;" > 7< / 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;" > 10< / 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 style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > continue< / 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:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i);< / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 程序结束！< / 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 >
< 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 > < h3 id = "_5-7-3-return" tabindex = "-1" > 5.7.3 return < a class = "header-anchor" href = "#_5-7-3-return" aria-label = "Permalink to "5.7.3 return"" > < / a > < / h3 > < ul > < li > return ：并非专门用于结束循环的，它的功能是结束一个方法。当一个方法执行到一个 return 语句的时候，这个方法将被结束。< / li > < / ul > < div class = "note custom-block github-alert" > < p class = "custom-block-title" > NOTE< / p > < p > < / p > < p > 和 break 和 continue 不同的是， < / 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:#D73A49;--shiki-dark:#F97583;" > for< / 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;" > 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;" > ; i < / 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;" > ; i< / 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;" > 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:#005CC5;--shiki-dark:#79B8FF;" > 7< / 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:#24292E;--shiki-dark:#E1E4E8;" > i < / 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;" > 7< / 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;" > 10< / 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 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 style = "--shiki-light:#6A737D;--shiki-dark:#6A737D;" > // 结束整个函数或方法< / 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:#032F62;--shiki-dark:#9ECBFF;" > " < / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > , i);< / 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:#6F42C1;--shiki-dark:#B392F0;" > printf< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > (< / span > < span style = "--shiki-light:#032F62;--shiki-dark:#9ECBFF;" > " 程序结束！< / 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 >
< span class = "line" > < span style = "--shiki-light:#D73A49;--shiki-dark:#F97583;" > return< / span > < span style = "--shiki-light:#005CC5;--shiki-dark:#79B8FF;" > 0< / span > < span style = "--shiki-light:#24292E;--shiki-dark:#E1E4E8;" > ;< / span > < / span >
2024-08-06 10:29:35 +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 > < / div > < / div > < / main > < footer class = "VPDocFooter" data-v-39a288b8 data-v-e257564d > <!-- [ --> <!-- ] --> < div class = "edit-info" data-v-e257564d > <!-- --> < div class = "last-updated" data-v-e257564d > < p class = "VPLastUpdated" data-v-e257564d data-v-e98dd255 > 上次更新: < time datetime = "2024-08-06T08:29:00.000Z" data-v-e98dd255 > < / time > < / p > < / div > < / div > < nav class = "prev-next" aria-labelledby = "doc-footer-aria-label" data-v-e257564d > < span class = "visually-hidden" id = "doc-footer-aria-label" data-v-e257564d > Pager< / span > < div class = "pager" data-v-e257564d > < a class = "VPLink link pager-link prev" href = "/c/notes/01_c-basic/03_xdx/" data-v-e257564d > <!-- [ --> < span class = "desc" data-v-e257564d > 上一篇< / span > < span class = "title" data-v-e257564d > 数据类型和运算符< / span > <!-- ] --> < / a > < / div > < div class = "pager" data-v-e257564d > < a class = "VPLink link pager-link next" href = "/c/notes/01_c-basic/05_xdx/" data-v-e257564d > <!-- [ --> < span class = "desc" data-v-e257564d > 下一篇< / span > < span class = "title" data-v-e257564d > 数组< / span > <!-- ] --> < / a > < / div > < / nav > < / footer > <!-- [ --> <!-- ] --> < / div > < / div > < / div > <!-- [ --> <!-- ] --> < / div > < / div > < footer class = "VPFooter has-sidebar" data-v-5d98c3a5 data-v-e315a0ad > < div class = "container" data-v-e315a0ad > < p class = "message" data-v-e315a0ad > Released under the MIT License.< / p > < p class = "copyright" data-v-e315a0ad > Copyright © 2024 许大仙< / p > < / div > < / footer > <!-- [ --> <!-- ] --> < / div > < / div >
< script > w i n d o w . _ _ V P _ H A S H _ M A P _ _ = J S O N . p a r s e ( " { \ " i n d e x . m d \ " : \ " D b L E 4 H 7 4 \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 1 _ x d x _ i n d e x . m d \ " : \ " D _ C G 5 P 4 p \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 2 _ x d x _ i n d e x . m d \ " : \ " D 3 O e 8 a O 6 \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 3 _ x d x _ i n d e x . m d \ " : \ " C _ n x Z A Z S \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 4 _ x d x _ i n d e x . m d \ " : \ " D D _ 5 n v Z T \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 5 _ x d x _ i n d e x . m d \ " : \ " D J m 9 f a d m \ " , \ " n o t e s _ 0 1 _ c - b a s i c _ 0 6 _ x d x _ i n d e x . m d \ " : \ " B B H p t z z _ \ " , \ " n o t e s _ 0 4 _ l i n u x _ 0 1 _ x d x _ i n d e x . m d \ " : \ " B p a 1 U f o _ \ " , \ " n o t e s _ i n d e x . m d \ " : \ " D H Y V 8 j v 1 \ " } " ) ; w i n d o w . _ _ V P _ S I T E _ D A T A _ _ = J S O N . p a r s e ( " { \ " l a n g \ " : \ " z h - C N \ " , \ " d i r \ " : \ " l t r \ " , \ " t i t l e \ " : \ " 许 大 仙 \ " , \ " t i t l e T e m p l a t e \ " : \ " H i ， 终 于 等 到 你 \ " , \ " d e s c r i p t i o n \ " : \ " 许 大 仙 前 端 、 J a v a 、 大 数 据 、 云 原 生 \ " , \ " b a s e \ " : \ " / c / \ " , \ " h e a d \ " : [ ] , \ " r o u t e r \ " : { \ " p r e f e t c h L i n k s \ " : t r u e } , \ " a p p e a r a n c e \ " : t r u e , \ " t h e m e C o n f i g \ " : { \ " l a s t U p d a t e d T e x t \ " : \ " 上 次 更 新 \ " , \ " r e t u r n T o T o p L a b e l \ " : \ " 返 回 顶 部 \ " , \ " s e a r c h \ " : { \ " p r o v i d e r \ " : \ " l o c a l \ " } , \ " l o g o \ " : \ " / l o g o . s v g \ " , \ " n a v \ " : [ { \ " t e x t \ " : \ " 首 页 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / \ " } , { \ " t e x t \ " : \ " 计 组 6 件 套 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / c o a 6 / n o t e s / \ " } , { \ " t e x t \ " : \ " 编 程 语 言 \ " , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " c / c + + \ " , \ " l i n k \ " : \ " / n o t e s / \ " } , { \ " t e x t \ " : \ " 前 端 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / w e b - d e s i g n / n o t e s / \ " } , { \ " t e x t \ " : \ " J a v a \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / j a v a / n o t e s / \ " } , { \ " t e x t \ " : \ " 大 数 据 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / b i g - d a t a / n o t e s / \ " } , { \ " t e x t \ " : \ " 云 原 生 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / l i n u x / n o t e s / \ " } , { \ " t e x t \ " : \ " G o \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / g o / n o t e s / \ " } , { \ " t e x t \ " : \ " P y t h o n \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / p y t h o n / n o t e s / \ " } ] } , { \ " t e x t \ " : \ " 开 源 软 件 \ " , \ " l i n k \ " : \ " h t t p s : / / a e x i a r . g i t h u b . i o / o p e n - s o f t w a r e / n o t e s / \ " } ] , \ " s i d e b a r \ " : { \ " / n o t e s / \ " : [ { \ " t e x t \ " : \ " C 语 言 基 础 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " C 语 言 入 门 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 1 _ x d x / \ " } , { \ " t e x t \ " : \ " 变 量 和 进 制 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 2 _ x d x / \ " } , { \ " t e x t \ " : \ " 数 据 类 型 和 运 算 符 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 3 _ x d x / \ " } , { \ " t e x t \ " : \ " 流 程 控 制 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 4 _ x d x / \ " } , { \ " t e x t \ " : \ " 数 组 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 5 _ x d x / \ " } , { \ " t e x t \ " : \ " 指 针 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 6 _ x d x / \ " } , { \ " t e x t \ " : \ " 函 数 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 7 _ x d x / \ " } , { \ " t e x t \ " : \ " 预 处 理 器 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 8 _ x d x / \ " } , { \ " t e x t \ " : \ " 自 定 义 数 据 类 型 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 0 9 _ x d x / \ " } , { \ " t e x t \ " : \ " 字 符 串 和 时 间 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 1 0 _ x d x / \ " } , { \ " t e x t \ " : \ " 内 存 管 理 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 1 1 _ x d x / \ " } , { \ " t e x t \ " : \ " 文 件 操 作 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 1 2 _ x d x / \ " } , { \ " t e x t \ " : \ " 调 试 工 具 和 调 试 技 巧 （ g d b 和 m a k e ） \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 1 3 _ x d x / \ " } , { \ " t e x t \ " : \ " 常 用 库 函 数 \ " , \ " l i n k \ " : \ " / n o t e s / 0 1 _ c - b a s i c / 1 4 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " C 语 言 高 级 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " 变 量 和 内 存 分 布 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 1 _ x d x / \ " } , { \ " t e x t \ " : \ " 指 针 强 化 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 2 _ x d x / \ " } , { \ " t e x t \ " : \ " 结 构 体 和 文 件 的 高 级 用 法 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 3 _ x d x / \ " } , { \ " t e x t \ " : \ " 链 表 和 回 调 函 数 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 4 _ x d x / \ " } , { \ " t e x t \ " : \ " 编 译 过 程 和 面 向 接 口 \ " , \ " l i n k \ " : \ " / n o t e s / 0 2 _ c - a d v a n c e / 0 5 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " 项 目 构 建 工 具 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " m e s o n \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " G r a d l e 入 门 \ " , \ " l i n k \ " : \ " / n o t e s / 0 3 _ b u i l d / 0 1 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " c m a k e \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " G r a d l e 入 门 \ " , \ " l i n k \ " : \ " / n o t e s / 0 3 _ b u i l d / 0 1 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " c o n a n \ " , \ " l i n k \ " : \ " / n o t e s / 0 3 _ b u i l d / 0 1 _ $ { c o m m o n D i r e c t o r y N a m e } / \ " } , { \ " t e x t \ " : \ " G r a d l e \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " G r a d l e 入 门 \ " , \ " l i n k \ " : \ " / n o t e s / 0 3 _ b u i l d / 0 1 _ x d x / \ " } ] } ] } , { \ " t e x t \ " : \ " L i n u x \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ { \ " t e x t \ " : \ " L i n u x 初 识 和 安 装 \ " , \ " l i n k \ " : \ " / n o t e s / 0 4 _ l i n u x / 0 1 _ x d x / \ " } ] } , { \ " t e x t \ " : \ " C + + 核 心 编 程 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ ] } , { \ " t e x t \ " : \ " C + + 标 准 库 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ ] } , { \ " t e x t \ " : \ " Q T 桌 面 开 发 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ ] } , { \ " t e x t \ " : \ " L i n u x 高 并 发 服 务 器 开 发 \ " , \ " c o l l a p s e d \ " : t r u e , \ " i t e m s \ " : [ ] } ] } , \ " s o c i a l L
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