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Aurorxa
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404.html
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404.html
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import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";const p="/c/assets/1.CTMA-Poz.jpg",h="/c/assets/2.B2g4y1OY.png",k="/c/assets/3.DEoM0p3m.png",t="/c/assets/4.DxEoA7Ht.png",e="/c/assets/5.DtY5Pf6u.png",r="/c/assets/6.CButBugT.png",E="/c/assets/7.DG_I9X5w.png",d="/c/assets/8.Cw8LCRHN.png",g="/c/assets/9.TqkSPw2X.png",c="/c/assets/10.Bkdbe2NL.png",y="/c/assets/11.D2yeCvfw.png",w=JSON.parse('{"title":"第一章：概述","description":"","frontmatter":{},"headers":[],"relativePath":"notes/01_c-basic/04_xdx/index.md","filePath":"notes/01_c-basic/04_xdx/index.md","lastUpdated":1721628994000}'),F={name:"notes/01_c-basic/04_xdx/index.md"},b=i('<h1 id="第一章-概述" tabindex="-1">第一章：概述 <a class="header-anchor" href="#第一章-概述" aria-label="Permalink to "第一章：概述""></a></h1><ul><li><p><code>流程控制结构</code>是用来控制程序中<code>各语句执行顺序</code>的语句，并且可以将语句组合成能<code>完成一定功能</code>的<code>小逻辑模块</code>。</p></li><li><p>在程序设计中规定了<code>三种</code>流程结构，如下所示：</p><ul><li><code>顺序结构</code>：程序从上到下逐行执行，中间没有任何判断和跳转。</li><li><code>分支结构</code>：根据条件，有选择的执行某段代码。在 C 语言中，有 <code>if...else</code> 和 <code>switch...case</code> 两种分支语句。</li><li><code>循环结构</code>：根据循环条件，重复性的执行某段代码。在 C 语言中，有 <code>for</code>、<code>while</code>、<code>do...while</code> 三种循环结构。</li></ul></li><li><p>在生活中的<code>洗衣工厂</code>，就包含了上述的三种流程结构，如下所示：</p></li></ul><p><img src="'+p+'" alt=""></p><h1 id="第二章-顺序结构" tabindex="-1">第二章：顺序结构 <a class="header-anchor" href="#第二章-顺序结构" aria-label="Permalink to "第二章：顺序结构""></a></h1><h2 id="_2-1-概述" tabindex="-1">2.1 概述 <a class="header-anchor" href="#_2-1-概述" aria-label="Permalink to "2.1 概述""></a></h2><ul><li>程序从上到下逐行地执行，表达式语句都是顺序执行的，并且上一行对某个变量的修改对下一行会产生影响。</li></ul><p><img src="'+h+`" alt=""></p><h2 id="_2-2-应用示例" tabindex="-1">2.2 应用示例 <a class="header-anchor" href="#_2-2-应用示例" aria-label="Permalink to "2.2 应用示例""></a></h2><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>
|
||||
import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";const p="/c/assets/1.CTMA-Poz.jpg",h="/c/assets/2.B2g4y1OY.png",k="/c/assets/3.DEoM0p3m.png",t="/c/assets/4.DxEoA7Ht.png",e="/c/assets/5.DtY5Pf6u.png",r="/c/assets/6.CButBugT.png",E="/c/assets/7.DG_I9X5w.png",d="/c/assets/8.Cw8LCRHN.png",g="/c/assets/9.TqkSPw2X.png",c="/c/assets/10.Bkdbe2NL.png",y="/c/assets/11.D2yeCvfw.png",w=JSON.parse('{"title":"第一章：概述","description":"","frontmatter":{},"headers":[],"relativePath":"notes/01_c-basic/04_xdx/index.md","filePath":"notes/01_c-basic/04_xdx/index.md","lastUpdated":1721631530000}'),F={name:"notes/01_c-basic/04_xdx/index.md"},b=i('<h1 id="第一章-概述" tabindex="-1">第一章：概述 <a class="header-anchor" href="#第一章-概述" aria-label="Permalink to "第一章：概述""></a></h1><ul><li><p><code>流程控制结构</code>是用来控制程序中<code>各语句执行顺序</code>的语句，并且可以将语句组合成能<code>完成一定功能</code>的<code>小逻辑模块</code>。</p></li><li><p>在程序设计中规定了<code>三种</code>流程结构，如下所示：</p><ul><li><code>顺序结构</code>：程序从上到下逐行执行，中间没有任何判断和跳转。</li><li><code>分支结构</code>：根据条件，有选择的执行某段代码。在 C 语言中，有 <code>if...else</code> 和 <code>switch...case</code> 两种分支语句。</li><li><code>循环结构</code>：根据循环条件，重复性的执行某段代码。在 C 语言中，有 <code>for</code>、<code>while</code>、<code>do...while</code> 三种循环结构。</li></ul></li><li><p>在生活中的<code>洗衣工厂</code>，就包含了上述的三种流程结构，如下所示：</p></li></ul><p><img src="'+p+'" alt=""></p><h1 id="第二章-顺序结构" tabindex="-1">第二章：顺序结构 <a class="header-anchor" href="#第二章-顺序结构" aria-label="Permalink to "第二章：顺序结构""></a></h1><h2 id="_2-1-概述" tabindex="-1">2.1 概述 <a class="header-anchor" href="#_2-1-概述" aria-label="Permalink to "2.1 概述""></a></h2><ul><li>程序从上到下逐行地执行，表达式语句都是顺序执行的，并且上一行对某个变量的修改对下一行会产生影响。</li></ul><p><img src="'+h+`" alt=""></p><h2 id="_2-2-应用示例" tabindex="-1">2.2 应用示例 <a class="header-anchor" href="#_2-2-应用示例" aria-label="Permalink to "2.2 应用示例""></a></h2><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>
|
||||
@ -18,7 +18,7 @@ import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";
|
||||
<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>
|
||||
<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，使用非 0 表示真（true），0 表示假（false）。</li><li>② 当条件表达式为真（非 0 ），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="`+k+`" 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>
|
||||
<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（true）</code>，<code>0</code> 表示<code>假（false）</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="`+k+`" 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>
|
||||
<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>
|
||||
@ -52,7 +52,7 @@ import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";
|
||||
<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>
|
||||
<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，使用非 0 表示真（true），0 表示假（false）。</li><li>② 当条件表达式为真（非 0 ），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="`+t+`" 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>
|
||||
<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（true）</code>，<code>0</code> 表示<code>假（false）</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="`+t+`" 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>
|
||||
<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>
|
||||
@ -107,7 +107,7 @@ import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";
|
||||
<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>
|
||||
<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，使用非 0 表示真（true），0 表示假（false）。</li><li>② 首先判断关系表达式 1 的结果是真（值不为 0）还是假（值为 0）： <ul><li>如果为真，就执行语句块 1，然后结束当前多分支。</li><li>如果是假，就继续判断条件表达式 2，看其结果是真还是假。</li><li>如果是真，就执行语句块 2，然后结束当前多分支。</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，然后结束当前多分支。</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="`+e+`" 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（含）到 80 分，奖励一个肉夹馍；如果成绩 80 分（含）到 90 分，奖励一个 ipad；如果成绩 90 分及以上，奖励一部华为 mate60 pro 。</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 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（true）</code>，<code>0</code> 表示<code>假（false）</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，然后结束当前多分支。</li><li>如果是假，就继续判断条件表达式 2，看其结果是真还是假。</li><li>如果是真，就执行语句块 2，然后结束当前多分支。</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，然后结束当前多分支。</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="`+e+`" 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（含）到 80 分，奖励一个肉夹馍；如果成绩 80 分（含）到 90 分，奖励一个 ipad；如果成绩 90 分及以上，奖励一部华为 mate60 pro 。</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>
|
||||
@ -385,7 +385,7 @@ import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";
|
||||
<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>
|
||||
<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> 中循环条件为非零值，表示true、真；为零值，表示false、伪。</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="`+d+`" 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>
|
||||
<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="`+d+`" 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>
|
||||
<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>
|
||||
@ -602,7 +602,7 @@ import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";
|
||||
<span class="line"><span style="--shiki-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>
|
||||
<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：break 语句用于终止某个语句块的执行，用在switch语句或者循环语句中。</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+`" alt=""></p><ul><li>示例：打印 <code>0 ~ 10</code> ，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>
|
||||
<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：break 语句用于终止某个语句块的执行，用在switch语句或者循环语句中。</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+`" 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>
|
||||
<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>
|
||||
@ -652,7 +652,7 @@ import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";
|
||||
<span class="line"><span style="--shiki-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><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：continue 语句用于结束本次循环，继续执行下一次循环。</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="`+y+`" alt=""></p><ul><li>示例：打印 <code>0 ~ 10</code> ，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>
|
||||
<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：continue 语句用于结束本次循环，继续执行下一次循环。</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="`+y+`" 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>
|
||||
<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>
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||||
<span class="line"></span>
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@ -1 +1 @@
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<span class="line"><span>build</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></div></div><h2 id="_7-6-演示" tabindex="-1">7.6 演示 <a class="header-anchor" href="#_7-6-演示" aria-label="Permalink to "7.6 演示""></a></h2><ul><li>我们可以在项目中，临时创建或复制一个文件，看上述配置是否生效，即：</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>如果是复制并粘贴一个文件到项目中，请点击<code>重新加载 CMake 项目</code>！！！</p></div><p><img src="/c/assets/158.C1t2T6FV.gif" alt=""></p><h1 id="第八章-c-语言的编译过程-⭐" tabindex="-1">第八章：C 语言的编译过程（⭐） <a class="header-anchor" href="#第八章-c-语言的编译过程-⭐" aria-label="Permalink to "第八章：C 语言的编译过程（⭐）""></a></h1><h2 id="_8-1-概述" tabindex="-1">8.1 概述 <a class="header-anchor" href="#_8-1-概述" aria-label="Permalink to "8.1 概述""></a></h2><ul><li>C 程序的编译过程，如下所示：</li></ul><p><img src="/c/assets/159.Rqa4uHq6.png" alt=""></p><ul><li>过程 ① ：编写（编辑）源代码，即：编写 C 语言源程序代码，并以文件的形式存储在磁盘中。</li></ul><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><p>源程序需要以 <code>.c</code> 作为扩展名。</p></div><ul><li>过程 ② ：编译，即：将 C 语言源程序转换为<code>目标程序（或目标文件）</code>。如果程序没有错误，没有任何提示，就会生成一个扩展名为 <code>.obj</code>或 <code>.o</code> 的二进制文件。C 语言中的每条可执行语句经过编译之后，最终都会转换为二进制的机器指令。</li></ul><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><ul><li><p>① 其实，<code>编译阶段</code>包含了<code>预处理</code>、<code>编译</code>和<code>汇编</code>。</p></li><li><p>② <code>预处理</code>是编译过程的第一个阶段。在这个阶段，预处理器处理源代码中的指令（例如：<code>#include</code>、<code>#define</code>等），主要任务包括：</p><ul><li><p><strong>头文件包含</strong>：将头文件的内容插入到源文件中。例如：<code>#include <stdio.h></code>会被替换为<code>stdio.h</code>文件的内容。</p></li><li><p><strong>宏展开</strong>：替换宏定义。例如：<code>#define PI 3.14</code>会将代码中的<code>PI</code>替换为<code>3.14</code>。</p></li><li><p><strong>条件编译</strong>：根据条件指令（如：<code>#ifdef</code>、<code>#ifndef</code>）有选择地编译代码。</p></li><li><p><strong>删除代码中的注释，但是不会进行语法检查</strong>。</p></li><li><p>预处理完成后，生成一个扩展名为<code>.i</code>的中间文件。</p></li></ul></li><li><p>③ <code>编译</code>是将预处理后的源代码转换为汇编代码的过程。在这个阶段，编译器会检查代码的语法和语义，将其转换为目标机器的汇编语言，生成一个扩展名为<code>.s</code>的汇编文件。</p></li><li><p>④ <code>汇编</code>是将汇编代码转换为机器代码（也称为目标代码或目标文件）的过程。在这个阶段，汇编器将汇编指令转换为二进制机器指令，生成一个扩展名为<code>.o</code>或 <code>.obj</code>的目标文件。</p></li></ul></div><ul><li>过程 ③ ：链接（连接），即：将编译形成的目标文件 <code>*.obj</code> 或 <code>*.o</code>和库函数以及其他目录文件<code>链接</code>，形成一个统一的二进制文件 <code>*.exe</code>。</li></ul><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><ul><li>为什么需要链接库文件？</li><li>因为我们的 C 程序会使用 C 程序库中的内容，如：<code><stdio.h></code> 中的 <code>printf()</code> 函数，这些函数不是程序员自己写的，而是 C 程序库中提供的，因此需要链接。其实，在链接过程中，还会加入启动代码，这个启动代码（和系统相关，Linux 下主要有 crt0.c、crti.c 等，它们设置堆栈后，再调用 main() 函数）负责初始化程序运行时的环境。</li></ul></div><ul><li>过程 ④ ：执行，即：有了可执行的 <code>*.exe</code>文件，我们就可以在控制台上执行运行此 <code>*.exe</code> 文件。</li></ul><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><p>如果<code>修改</code>了源代码，还需要重新<code>编译</code>、<code>链接</code>，并生成新的 <code>*.exe</code>文件，再执行，方能生效。</p></div><h2 id="_8-2-gcc-编译器的介绍" tabindex="-1">8.2 GCC 编译器的介绍 <a class="header-anchor" href="#_8-2-gcc-编译器的介绍" aria-label="Permalink to "8.2 GCC 编译器的介绍""></a></h2><ul><li>编辑器，如：vim 、vscode 等，是指我们用它来编写源程序的（编辑代码），而我们写的代码语句，电脑是不懂的，我们需要把它转成电脑能懂的语句，编译器就是这样的转化工具。换言之，我们用编辑器编写程序，由编译器编译后才可以运行！</li><li>编译器是将易于编写、阅读和维护的高级计算机语言翻译为计算机能解读、运行的低级机器语言的程序。</li><li>gcc（GNU Compiler Collection，GNU 编译器套件），是由 GNU 开发的编程语言编译器。gcc 原本作为 GNU 操作系统的官方编译器，现已被大多数类 Unix 操作系统（如：Linux、BSD、Mac OS X 等）采纳为标准的编译器，gcc 同样适用于微软的 Windows 。</li><li>gcc 最初用于编译 C 语言，随着项目的发展， gcc 已经成为了能够编译 C、C++、Java、Ada、fortran、Object C、Object C++、Go 语言的编译器大家族。</li></ul><h2 id="_8-3-通过-gcc-直接生成可执行文件" tabindex="-1">8.3 通过 gcc 直接生成可执行文件 <a class="header-anchor" href="#_8-3-通过-gcc-直接生成可执行文件" aria-label="Permalink to "8.3 通过 gcc 直接生成可执行文件""></a></h2><ul><li>示例：进行预处理、编译、汇编和链接</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.c</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.exe</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p><img src="/c/assets/160.6yQYnjOa.gif" alt=""></p><h2 id="_8-4-通过-gcc-分步编译" tabindex="-1">8.4 通过 gcc 分步编译 <a class="header-anchor" href="#_8-4-通过-gcc-分步编译" aria-label="Permalink to "8.4 通过 gcc 分步编译""></a></h2><h3 id="_8-3-1-概述" tabindex="-1">8.3.1 概述 <a class="header-anchor" href="#_8-3-1-概述" aria-label="Permalink to "8.3.1 概述""></a></h3><ul><li>预处理命令：</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -E</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 源文件.c</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 源文件.i</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> # 通常以 .i 结尾表示这个文件是一个中间状态</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><ul><li>编译（预处理和编译）命令：</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -S</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 源文件.i</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 源文件.s</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> # 在 Linux 中，通常以 .s 结尾；在 Windows 中，通常以 .asm 结尾</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><ul><li>汇编（预处理、编译和汇编）命令：</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -c</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 源文件.s</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 源文件.o</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> # 在 Linux 中，通常以 .o 结尾；在 Windows 中，通常以 .obj 结尾</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><ul><li>链接（预处理、编译、汇编和链接）命令：</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 源文件.o</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 源文件.exe</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> # 在 Linux 中，通常以 .out 结尾；在 Windows 中，通常以 .exe 结尾</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="_8-4-2-应用示例" tabindex="-1">8.4.2 应用示例 <a class="header-anchor" href="#_8-4-2-应用示例" aria-label="Permalink to "8.4.2 应用示例""></a></h3><ul><li>示例：只进行预处理</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -E</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.c</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.i</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p><img src="/c/assets/161.hYR9GiiD.gif" alt=""></p><ul><li>示例：只进行预处理和编译</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -S</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.i</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.s</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p><img src="/c/assets/162.D3b-QIrA.gif" alt=""></p><ul><li>示例：只进行预处理、编译和汇编</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -c</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.s</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.o</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p><img src="/c/assets/163.DGbA6qsW.gif" alt=""></p><ul><li>示例：进行预处理、编译、汇编和链接</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">gcc</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.o</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -o</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> HelloWorld.exe</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p><img src="/c/assets/164.BToOkxf2.gif" 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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div><h2 id="_3-3-进制的转换" tabindex="-1">3.3 进制的转换 <a class="header-anchor" href="#_3-3-进制的转换" aria-label="Permalink to "3.3 进制的转换""></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>不同进制的转换，如下所示：</li></ul><p><img src="/c/assets/19.uqLiL_yu.png" alt=""></p><ul><li>在计算机中，数据是从右往左的方式排列的；其中，最右边的是低位，最左边的是高位，即：</li></ul><p><img src="/c/assets/20.CkykpHY2.png" alt=""></p><h3 id="_3-3-2-二进制和十进制的转换" tabindex="-1">3.3.2 二进制和十进制的转换 <a class="header-anchor" href="#_3-3-2-二进制和十进制的转换" aria-label="Permalink to "3.3.2 二进制和十进制的转换""></a></h3><h4 id="_3-3-2-1-二进制转换为十进制" tabindex="-1">3.3.2.1 二进制转换为十进制 <a class="header-anchor" href="#_3-3-2-1-二进制转换为十进制" aria-label="Permalink to "3.3.2.1 二进制转换为十进制""></a></h4><ul><li>规则：从最低位开始，将每个位上的数提取出来，乘以 2 的 （位数 - 1 ）次方，然后求和。</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 在学术界，将这种计算规则，称为<code>位权相加法</code>。</li><li>② <code>八进制转换为十进制</code>、<code>十六进制转换为十进制</code>和<code>二进制转换为十进制</code>的算法相同！！！</li></ul></div><ul><li>示例：十进制转十进制</li></ul><p><img src="/c/assets/21.DV1YbrOP.png" alt=""></p><ul><li>示例：二进制转十进制</li></ul><p><img src="/c/assets/22.AHNJT9TV.png" alt=""></p><h4 id="_3-3-2-2-十进制转换二进制" tabindex="-1">3.3.2.2 十进制转换二进制 <a class="header-anchor" href="#_3-3-2-2-十进制转换二进制" aria-label="Permalink to "3.3.2.2 十进制转换二进制""></a></h4><ul><li>规则：将该数不断除以 2 ，直到商为 0 为止，然后将每步得到的余数倒过来，就是对应的二进制。</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 在学术界，将这种计算规则，称为<code>短除法</code>或<code>连续除2取余法</code>。</li><li>② 很好理解，只有不断地除以 2 ，就能保证最大的数字不超过 2 ，这不就是二进制（只能有 0 或 1）吗？</li><li>③ <code>八进制转换为二进制</code>、<code>十六进制转换为二进制</code>和<code>十进制转换为二进制</code>的算法相同！！！</li></ul></div><ul><li>示例：十进制转十进制</li></ul><p><img src="/c/assets/23.Bs-MOwx2.png" alt=""></p><ul><li>示例：十进制转二进制</li></ul><p><img src="/c/assets/24.StzjmBz-.png" alt=""></p><h3 id="_3-3-3-二进制转八进制" tabindex="-1">3.3.3 二进制转八进制 <a class="header-anchor" href="#_3-3-3-二进制转八进制" aria-label="Permalink to "3.3.3 二进制转八进制""></a></h3><ul><li><p>规则：每 3 位二进制就是一个八进制。</p></li><li><p>示例：011 101 001 -> 351</p></li></ul><p><img src="/c/assets/25.C0wVWaxD.png" alt=""></p><h3 id="_3-3-4-二进制转十六进制" tabindex="-1">3.3.4 二进制转十六进制 <a class="header-anchor" href="#_3-3-4-二进制转十六进制" aria-label="Permalink to "3.3.4 二进制转十六进制""></a></h3><ul><li><p>规则：每 4 位二进制就是一个十六进制。</p></li><li><p>示例：1110 1001 -> 0xE9</p></li></ul><p><img src="/c/assets/26.LXJMAihe.png" alt=""></p><h2 id="_3-4-原码、反码和补码" tabindex="-1">3.4 原码、反码和补码 <a class="header-anchor" href="#_3-4-原码、反码和补码" aria-label="Permalink to "3.4 原码、反码和补码""></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>机器数：一个数在计算机的存储形式是二进制，我们称这些二进制数为机器数。机器数可以是有符号的，用机器数的最高位来存放符号位，0 表示正数，1 表示负数。</li></ul><p><img src="/c/assets/27._UTCq3PD.png" alt=""></p><ul><li>真值：因为机器数带有符号位，所以机器数的形式值不等于其真实表示的值（真值），以机器数 1000 0001 为例，其真正表示的值（首位是符号位）为 -1，而形式值却是 129 ，因此将带有符号位的机器数的真正表示的值称为机器数的真值。</li></ul><p><img src="/c/assets/28.BjQ5kBL-.png" alt=""></p><h3 id="_3-4-2-原码" tabindex="-1">3.4.2 原码 <a class="header-anchor" href="#_3-4-2-原码" aria-label="Permalink to "3.4.2 原码""></a></h3><ul><li>原码的表示与机器数真值表示的一样，即用第一位表示符号，其余位表示数值。</li><li>规则： <ul><li>正数的<code>原码</code>是它本身对应的二进制数，符号位是 0 。</li><li>负数的<code>原码</code>是它本身绝对值对应的二进制数，但是符号位是 1 。</li></ul></li><li>+1 的原码，使用 8 位二进数来表示，就是：</li></ul><table tabindex="0"><thead><tr><th>十进制数</th><th>原码（8位二进制数）</th></tr></thead><tbody><tr><td>+1</td><td><code>0</code>000 0001</td></tr></tbody></table><ul><li>-1 的原码，使用 8 位二进数来表示，就是：</li></ul><table tabindex="0"><thead><tr><th>十进制数</th><th>原码（8位二进制数）</th></tr></thead><tbody><tr><td>-1</td><td><code>1</code>000 0001</td></tr></tbody></table><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><p>按照原码的规则，会出现 <code>+0</code> 和 <code>-0</code> 的情况，即：<code>0</code>000 0000（+0）、<code>1</code>000 0000（-0），显然不符合实际情况；所以，计算机底层虽然存储和计算的都是二进数，但显然不是原码。</p></div><h3 id="_3-4-3-反码" tabindex="-1">3.4.3 反码 <a class="header-anchor" href="#_3-4-3-反码" aria-label="Permalink to "3.4.3 反码""></a></h3><ul><li><p>规则：</p><ul><li>正数的反码和它的原码相同。</li><li>负数的反码是在其原码的基础上，符号位不变，其余各位取反。</li></ul></li><li><p>+1 的反码，使用 8 位二进数来表示，就是：</p></li></ul><table tabindex="0"><thead><tr><th>十进制数</th><th>原码（8位二进制数）</th><th>反码（8位二进制数）</th></tr></thead><tbody><tr><td>+1</td><td><code>0</code>000 0001</td><td><code>0</code>000 0001</td></tr></tbody></table><ul><li>-1 的反码，使用 8 位二进数来表示，就是：</li></ul><table tabindex="0"><thead><tr><th>十进制数</th><th>原码（8位二进制数）</th><th>反码（8位二进制数）</th></tr></thead><tbody><tr><td>-1</td><td><code>1</code>000 0001</td><td><code>1</code>111 1110</td></tr></tbody></table><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><p>按照反码的规则，如果是 <code>+0</code>，对应的原码是 <code>0</code>000 0000；那么，其反码还是 <code>0</code>000 0000 ；如果是 <code>-0</code>，对应的原码是 <code>1</code>000 0000，其反码是 <code>1</code>111 1111，显然不符合实际情况；所以，计算机底层虽然存储和计算的都是二进数，但显然不是反码。</p></div><h3 id="_3-4-4-补码" tabindex="-1">3.4.4 补码 <a class="header-anchor" href="#_3-4-4-补码" aria-label="Permalink to "3.4.4 补码""></a></h3><ul><li><p>规则：</p><ul><li>正数的补码和它的原码相同。</li><li>负数的补码是在其反码的基础上 + 1 。</li></ul></li><li><p>+1 的补码，使用 8 位二进数来表示，就是：</p></li></ul><table tabindex="0"><thead><tr><th>十进制数</th><th>原码（8位二进制数）</th><th>反码（8位二进制数）</th><th>补码（8位二进制数）</th></tr></thead><tbody><tr><td>+1</td><td><code>0</code>000 0001</td><td><code>0</code>000 0001</td><td><code>0</code>000 0001</td></tr></tbody></table><ul><li>-1 的补码，使用 8 位二进数来表示，就是：</li></ul><table tabindex="0"><thead><tr><th>十进制数</th><th>原码（8位二进制数）</th><th>反码（8位二进制数）</th><th>补码（8位二进制数）</th></tr></thead><tbody><tr><td>-1</td><td><code>1</code>000 0001</td><td><code>1</code>111 1110</td><td><code>1</code>111 1111</td></tr></tbody></table><ul><li>如果 0 ，按照 <code>+0</code> 的情况进行处理，即：</li></ul><p><img src="/c/assets/29.COIOzcmT.png" alt=""></p><ul><li>如果 0 ，按照 <code>-0</code> 的情况进行处理，即：</li></ul><p><img src="/c/assets/30.Cu__mjav.png" alt=""></p><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><ul><li>① 补码表示法解决了<code>原码</code>和<code>反码</code>存在的<code>两种</code>零（<code>+0</code> 和 <code>-0</code>）的问题，即：在补码表示法中，只有<code>一个</code>零，即 0000 0000。</li><li>②补码使得<code>加法运算</code>和<code>减法运算</code>可以统一处理，通过将减法运算<code>转换</code>为加法运算，可以简化硬件设计，提高了运算效率。</li><li>③ 计算机底层<code>存储</code>和<code>计算</code>的都是<code>二进数的补码</code>。</li></ul></div><h3 id="_3-4-5-总结" tabindex="-1">3.4.5 总结 <a class="header-anchor" href="#_3-4-5-总结" aria-label="Permalink to "3.4.5 总结""></a></h3><ul><li>① 正数的原码、反码和补码都是一样的，三码合一。</li><li>② 负数的反码是在其原码的基础上，按位取反（0 变 1 ，1 变 0 ），符号位不变；负数的补码是其反码 + 1 。</li><li>③ 0 的补码是 0 。</li></ul><h2 id="_3-5-计算机底层为什么使用补码" tabindex="-1">3.5 计算机底层为什么使用补码？ <a class="header-anchor" href="#_3-5-计算机底层为什么使用补码" aria-label="Permalink to "3.5 计算机底层为什么使用补码？""></a></h2><ul><li>如果计算是 <code>2 - 2</code> ，那么可以转换为 <code>2 + (-2)</code>，这样计算机内部在处理<code>减法计算</code>的时候，就会将其转换为<code>加法计算</code>的形式，以简化硬件设计和提高计算效率。</li><li><code>最高位</code>表示<code>符号位</code>，由于符号位的存在，如果使用<code>原码</code>来计算，就会导致<code>计算结果不正确</code>，即：</li></ul><p><img src="/c/assets/31.BX_KzkHt.png" alt=""></p><ul><li><code>补码</code>的设计可以巧妙的让<code>符号位</code>也参与计算，并且可以得到<code>正确的计算结果</code>，即：</li></ul><p><img src="/c/assets/32.COt_QxSP.png" alt=""></p></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-d4a0bba5><!--[--><!--]--><div class="edit-info" data-v-d4a0bba5><!----><div class="last-updated" data-v-d4a0bba5><p class="VPLastUpdated" data-v-d4a0bba5 data-v-7e05ebdb>上次更新: <time datetime="2024-07-17T07:44:31.000Z" data-v-7e05ebdb></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-d4a0bba5><span class="visually-hidden" id="doc-footer-aria-label" data-v-d4a0bba5>Pager</span><div class="pager" data-v-d4a0bba5><a class="VPLink link pager-link prev" href="/c/notes/01_c-basic/01_xdx/" 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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><h2 id="_2-8-运算符优先级" tabindex="-1">2.8 运算符优先级 <a class="header-anchor" href="#_2-8-运算符优先级" aria-label="Permalink to "2.8 运算符优先级""></a></h2><ul><li>C 语言中运算符的优先级，如下所示：</li></ul><table tabindex="0"><thead><tr><th><strong>优先级</strong></th><th><strong>运算符</strong></th><th><strong>名称或含义</strong></th><th><strong>结合方向</strong></th></tr></thead><tbody><tr><td><strong>1</strong></td><td><code>[]</code></td><td>数组下标</td><td>左到右</td></tr><tr><td></td><td><code>()</code></td><td>圆括号</td><td></td></tr><tr><td></td><td><code>.</code></td><td>成员选择（对象）</td><td></td></tr><tr><td></td><td><code>-></code></td><td>成员选择（指针）</td><td></td></tr><tr><td><strong>2</strong></td><td><code>-</code></td><td>负号运算符</td><td>右到左</td></tr><tr><td></td><td><code>（类型）</code></td><td>强制类型转换</td><td></td></tr><tr><td></td><td><code>++</code></td><td>自增运算符</td><td></td></tr><tr><td></td><td><code>--</code></td><td>自减运算符</td><td></td></tr><tr><td></td><td><code>*</code></td><td>取值运算符</td><td></td></tr><tr><td></td><td><code>&</code></td><td>取地址运算符</td><td></td></tr><tr><td></td><td><code>!</code></td><td>逻辑非运算符</td><td></td></tr><tr><td></td><td><code>~</code></td><td>按位取反运算符</td><td></td></tr><tr><td></td><td><code>sizeof</code></td><td>长度运算符</td><td></td></tr><tr><td><strong>3</strong></td><td><code>/</code></td><td>除</td><td>左到右</td></tr><tr><td></td><td><code>*</code></td><td>乘</td><td></td></tr><tr><td></td><td><code>%</code></td><td>余数（取模）</td><td></td></tr><tr><td><strong>4</strong></td><td><code>+</code></td><td>加</td><td>左到右</td></tr><tr><td></td><td><code>-</code></td><td>减</td><td></td></tr><tr><td><strong>5</strong></td><td><code><<</code></td><td>左移</td><td>左到右</td></tr><tr><td></td><td><code>>></code></td><td>右移</td><td></td></tr><tr><td><strong>6</strong></td><td><code>></code></td><td>大于</td><td>左到右</td></tr><tr><td></td><td><code>>=</code></td><td>大于等于</td><td></td></tr><tr><td></td><td><code><</code></td><td>小于</td><td></td></tr><tr><td></td><td><code><=</code></td><td>小于等于</td><td></td></tr><tr><td><strong>7</strong></td><td><code>==</code></td><td>等于</td><td>左到右</td></tr><tr><td></td><td><code>!=</code></td><td>不等于</td><td></td></tr><tr><td><strong>8</strong></td><td><code>&</code></td><td>按位与</td><td>左到右</td></tr><tr><td><strong>9</strong></td><td><code>^</code></td><td>按位异或</td><td>左到右</td></tr><tr><td><strong>10</strong></td><td><code>|</code></td><td>按位或</td><td>左到右</td></tr><tr><td><strong>11</strong></td><td><code>&&</code></td><td>逻辑与</td><td>左到右</td></tr><tr><td><strong>12</strong></td><td><code>||</code></td><td>逻辑或</td><td>左到右</td></tr><tr><td><strong>13</strong></td><td><code>?:</code></td><td>条件运算符</td><td>右到左</td></tr><tr><td><strong>14</strong></td><td><code>=</code></td><td>赋值运算符</td><td>右到左</td></tr><tr><td></td><td><code>/=</code></td><td>除后赋值</td><td></td></tr><tr><td></td><td><code>*=</code></td><td>乘后赋值</td><td></td></tr><tr><td></td><td><code>%=</code></td><td>取模后赋值</td><td></td></tr><tr><td></td><td><code>+=</code></td><td>加后赋值</td><td></td></tr><tr><td></td><td><code>-=</code></td><td>减后赋值</td><td></td></tr><tr><td></td><td><code><<=</code></td><td>左移后赋值</td><td></td></tr><tr><td></td><td><code>>>=</code></td><td>右移后赋值</td><td></td></tr><tr><td></td><td><code>&=</code></td><td>按位与后赋值</td><td></td></tr><tr><td></td><td><code>^=</code></td><td>按位异或后赋值</td><td></td></tr><tr><td></td><td><code>|=</code></td><td>按位或后赋值</td><td></td></tr><tr><td><strong>15</strong></td><td><code>,</code></td><td>逗号运算符</td><td>左到右</td></tr></tbody></table><div class="warning custom-block github-alert"><p class="custom-block-title">WARNING</p><p></p><ul><li>① 不要过多的依赖运算符的优先级来控制表达式的执行顺序，这样可读性太差，尽量<code>使用小括号来控制</code>表达式的执行顺序。</li><li>② 不要把一个表达式写得过于复杂，如果一个表达式过于复杂，则把它<code>分成几步</code>来完成。</li><li>③ 运算符优先级不用刻意地去记忆，总体上：一元运算符 > 算术运算符 > 关系运算符 > 逻辑运算符 > 三元运算符 > 赋值运算符。</li></ul></div><h1 id="第三章-附录" tabindex="-1">第三章：附录 <a class="header-anchor" href="#第三章-附录" aria-label="Permalink to "第三章：附录""></a></h1><h2 id="_3-1-字符集和字符集编码" tabindex="-1">3.1 字符集和字符集编码 <a class="header-anchor" href="#_3-1-字符集和字符集编码" aria-label="Permalink to "3.1 字符集和字符集编码""></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>字符集和字符集编码（简称编码）计算机系统中处理文本数据的两个基本概念，它们密切相关但又有区别。</li><li>字符集（Character Set）是一组字符的集合，其中每个字符都被分配了一个<code>唯一的编号</code>（通常是数字）。字符可以是字母、数字、符号、控制代码（如换行符）等。<code>字符集定义了可以表示的字符的范围</code>，但它并不直接定义如何将这些字符存储在计算机中。</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>ASCII（美国信息交换标准代码）是最早期和最简单的字符集之一，它只包括了英文字母、数字和一些特殊字符，共 128 个字符。每个字符都分配给了一个从 0 到 127 的数字。</p></div><ul><li>字符集编码（Character Encoding，简称编码）是一种方案或方法，<code>它定义了如何将字符集中的字符转换为计算机存储和传输的数据（通常是一串二进制数字）</code>。简而言之，编码是字符到二进制数据之间的映射规则。</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>ASCII编码方案定义了如何将 ASCII 字符集中的每个字符表示为 7 位的二进制数字。例如：大写字母<code>"A"</code>在ASCII 编码中表示为二进制的<code>1000001</code>，十进制的 <code>65</code> 。</p></div><ul><li><code>字符集</code>和<code>字符集编码</code>之间的关系如下：</li></ul><p><img src="/c/assets/29.CGTVELeO.png" alt=""></p><ul><li>Linux 中安装帮助手册：</li></ul><p><img src="/c/assets/30.Bz4_lEH0.gif" alt=""></p><h3 id="_3-3-2-ascii-编码" tabindex="-1">3.3.2 ASCII 编码 <a class="header-anchor" href="#_3-3-2-ascii-编码" aria-label="Permalink to "3.3.2 ASCII 编码""></a></h3><ul><li>从<code>冯·诺依曼</code>体系结构中，我们知道，计算机中所有的<code>数据</code>和<code>指令</code>都是以<code>二进制</code>的形式表示的；所以，计算机中对于文本数据的数据也是以二进制来存储的，那么对应的流程如下：</li></ul><p><img src="/c/assets/31.CcDWE4nn.png" alt=""></p><ul><li>我们知道，计算机是上个世纪 60 年代在美国研制成功的，为了实现字符和二进制的转换，美国就制定了一套字符编码，即英语字符和二进制位之间的关系，即 ASCII （American Standard Code for Information Interchange）编码： <ul><li>ASCII 编码只包括了英文字符、数字和一些特殊字符，一共 128 个字符，并且每个字符都分配了唯一的数字，范围是 0 - 127。</li><li>ASCII 编码中的每个字符都使用 7 位的二进制数字表示；但是，计算机中的存储的最小单位是 1 B = 8 位，那么最高位统一规定为 0 。</li></ul></li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 其实，早期是没有字符集的概念的，只是后来为了解决乱码问题，而产生了字符集的概念。</li><li>② 对于英文体系来说，<code>a-zA-Z0-9</code>以及一些<code>特殊字符</code>一共 <code>128</code> 就可以满足实际存储需求；所以，在也是为什么 ASCII 码使用 7 位二进制（2^7 = 128 ）来存储的。</li></ul></div><ul><li>在操作系统中，就内置了对应的编码表，Linux 也不例外；可以使用如下的命令查看：</li></ul><div class="language-shell vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">shell</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">man</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> ascii</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p><img src="/c/assets/32.B7y2_JVX.gif" alt=""></p><ul><li>其对应的 ASCII 编码表，如下所示：</li></ul><p><img src="/c/assets/33.Btcc3rs2.gif" alt=""></p><ul><li>但是，随着计算机的发展，计算机开始了东征之路，由美国传播到东方：</li></ul><p><img src="/c/assets/34.CR4ARW8y.png" alt=""></p><ul><li>先是传播到了欧洲，欧洲在兼容 ASCII 编码的基础上，推出了 ISO8859-1 编码，即： <ul><li>ISO8859-1 编码包括基本的拉丁字母表、数字、标点符号，以及西欧语言中特有的一些字符，如：法语中的 <code>è</code>、德语中的 <code>ü</code> 等。</li><li>ISO 8859-1 为每个字符分配一个单字节（8 位）编码，意味着它可以表示最多 256 （2^8）个不同的字符（编号从 0 到 255）。</li><li>ISO 8859-1 的前 128 个字符与 ASCII 编码完全一致，这使得 ASCII 编码的文本可以无缝转换为 ISO 8859-1 编码。</li></ul></li></ul><p><img src="/c/assets/33.Btcc3rs2.gif" alt=""></p><p><img src="/c/assets/36.DOX3ymYP.gif" alt=""></p><ul><li>计算机继续传播到了亚洲，亚洲（双字节）各个国家分别给出了自己国家对应的字符集编码，如： <ul><li>日本推出了 Shift-JIS 编码： <ul><li>单字节 ASCII 范围：0 - 127。</li><li>双字节范围： <ul><li>第一个字节：129 - 159 和 224 - 239 。</li><li>第二个字节：64 - 126 和 128 - 252 。</li></ul></li></ul></li><li>韩国推出了 EUC-KR 编码： <ul><li>单字节 ASCII 范围：0 - 127。</li><li>双字节范围：从 41281 - 65278。</li></ul></li><li>中国推出了 GBK 编码： <ul><li>单字节 ASCII 范围：0 - 127。</li><li>双字节范围：33088 - 65278 。</li></ul></li></ul></li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 通过上面日本、韩国、中国的编码十进制范围，我们可以看到，虽然这些编码系统在技术上的编码范围存在重叠（特别是在高位字节区域），但因为它们各自支持的字符集完全不同，所以实际上它们并不直接冲突。</li><li>② 但是，如果一个中国人通过 GBK 编码写的文章，通过邮件发送给韩国人，因为韩国和中国在字符集编码上的高位字节有重叠部分，必然会造成歧义。</li></ul></div><h3 id="_3-3-3-unicode-编码" tabindex="-1">3.3.3 Unicode 编码 <a class="header-anchor" href="#_3-3-3-unicode-编码" aria-label="Permalink to "3.3.3 Unicode 编码""></a></h3><ul><li><p>在 Unicode 之前，世界上存在着数百种不同的编码系统，每一种编码系统都是为了支持特定语言或一组语言的字符集。这些编码系统，包括：ASCII、ISO 8859 系列、GBK、Shift-JIS、EUC-KR 等，它们各自有不同的字符范围和编码方式。这种多样性虽然在局部范围内解决了字符表示的问题，但也带来了以下几个方面的挑战：</p><ul><li><code>编码冲突</code>：由于不同的编码系统可以为相同的字节值分配不同的字符，因此在不同编码之间转换文本时，如果没有正确处理编码信息，就很容易产生乱码。这种编码冲突在尝试处理多种语言的文本时尤为突出。</li><li><code>编码的复杂性</code>：随着全球化的发展，软件和系统需要支持越来越多的语言，这就要求开发者和系统同时处理多种不同的编码系统。这不仅增加了开发和维护的复杂性，而且也增加了出错的风险。</li><li><code>资源限制</code>：在早期计算机技术中，内存和存储资源相对有限。不同的编码标准要求系统存储多套字符集数据，这无疑增加了对有限资源的消耗。</li><li>……</li></ul></li><li><p>针对上述的种种问题，为了推行全球化，Unicode 应运而生，Unicode 的核心规则和设计原则是建立一个全球统一的字符集，使得世界上所有的文字和符号都能被唯一地识别和使用，无论使用者位于何地或使用何种语言。这套规则包括了字符的编码、表示、处理和转换机制，旨在确保不同系统和软件间能够无缝交换和处理文本数据。</p><ul><li><code>通用字符集 (UCS)</code>：Unicode 为每一个字符分配一个唯一的编号（称为<code>“码点”</code>）。这些码点被组织在一个统一的字符集中，官方称之为 “通用字符集”（Universal Character Set，UCS）。码点通常表示为 <code>U+</code> 后跟一个十六进制数，例如：<code>U+0041</code> 代表大写的英文字母 <code>“A”</code>。</li><li><code>编码平面和区段</code>：Unicode 码点被划分为多个 “平面（Planes）”，每个平面包含 65536（16^4）个码点。目前，Unicode定义了 17 个平面（从 0 到16），每个平面被分配了一个编号，从 “基本多文种平面（BMP）” 的 0 开始，到 16 号平面结束。这意味着 Unicode 理论上可以支持超过 110万（17*65536）个码点。</li></ul></li><li><p>Unicode 仅仅只是字符集，给每个字符设置了唯一的数字编号而已，却没有给出这些数字编号实际如何存储，可以通过如下命令查看：</p></li></ul><p><img src="/c/assets/37.Cie9_tkP.gif" alt=""></p><ul><li>为了在计算机系统中表示 Unicode 字符，定义了几种编码方案，这些方案包括 UTF-8、UTF-16 和 UTF-32 等。 <ul><li><strong>UTF-8</strong>：使用 1 - 4 个字节表示每个 Unicode 字符，兼容 ASCII，是网络上最常用的编码。</li><li><strong>UTF-16</strong>：使用 2 - 4 个字节表示每个 Unicode 字符，适合于需要经常处理基本多文种平面之外字符的应用。</li><li><strong>UTF-32</strong>：使用固定的 4 个字节表示每个 Unicode 字符，简化了字符处理，但增加了存储空间的需求。</li></ul></li><li><code>Unicode 字符集</code>和对应的<code>UTF-8 字符编码</code>之间的关系，如下所示：</li></ul><p><img src="/c/assets/38.DLjH9Ges.png" alt=""></p></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-d4a0bba5><!--[--><!--]--><div class="edit-info" data-v-d4a0bba5><!----><div class="last-updated" data-v-d4a0bba5><p class="VPLastUpdated" data-v-d4a0bba5 data-v-7e05ebdb>上次更新: <time datetime="2024-07-19T08:20:18.000Z" 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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br></div></div><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>
|
||||
<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，使用非 0 表示真（true），0 表示假（false）。</li><li>② 当条件表达式为真（非 0 ），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>
|
||||
<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（true）</code>，<code>0</code> 表示<code>假（false）</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>
|
||||
<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>
|
||||
@ -74,7 +74,7 @@
|
||||
<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>
|
||||
<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，使用非 0 表示真（true），0 表示假（false）。</li><li>② 当条件表达式为真（非 0 ），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>
|
||||
<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（true）</code>，<code>0</code> 表示<code>假（false）</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>
|
||||
<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>
|
||||
@ -129,7 +129,7 @@
|
||||
<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>
|
||||
<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，使用非 0 表示真（true），0 表示假（false）。</li><li>② 首先判断关系表达式 1 的结果是真（值不为 0）还是假（值为 0）： <ul><li>如果为真，就执行语句块 1，然后结束当前多分支。</li><li>如果是假，就继续判断条件表达式 2，看其结果是真还是假。</li><li>如果是真，就执行语句块 2，然后结束当前多分支。</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，然后结束当前多分支。</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（含）到 80 分，奖励一个肉夹馍；如果成绩 80 分（含）到 90 分，奖励一个 ipad；如果成绩 90 分及以上，奖励一部华为 mate60 pro 。</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 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（true）</code>，<code>0</code> 表示<code>假（false）</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，然后结束当前多分支。</li><li>如果是假，就继续判断条件表达式 2，看其结果是真还是假。</li><li>如果是真，就执行语句块 2，然后结束当前多分支。</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，然后结束当前多分支。</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（含）到 80 分，奖励一个肉夹馍；如果成绩 80 分（含）到 90 分，奖励一个 ipad；如果成绩 90 分及以上，奖励一部华为 mate60 pro 。</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>
|
||||
@ -407,7 +407,7 @@
|
||||
<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>
|
||||
<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> 中循环条件为非零值，表示true、真；为零值，表示false、伪。</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>
|
||||
<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>
|
||||
<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>
|
||||
@ -624,7 +624,7 @@
|
||||
<span class="line"><span style="--shiki-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>
|
||||
<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：break 语句用于终止某个语句块的执行，用在switch语句或者循环语句中。</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/10.Bkdbe2NL.png" alt=""></p><ul><li>示例：打印 <code>0 ~ 10</code> ，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>
|
||||
<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：break 语句用于终止某个语句块的执行，用在switch语句或者循环语句中。</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/10.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>
|
||||
<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>
|
||||
@ -674,7 +674,7 @@
|
||||
<span class="line"><span style="--shiki-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><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：continue 语句用于结束本次循环，继续执行下一次循环。</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/11.D2yeCvfw.png" alt=""></p><ul><li>示例：打印 <code>0 ~ 10</code> ，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>
|
||||
<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：continue 语句用于结束本次循环，继续执行下一次循环。</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/11.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>
|
||||
<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>
|
||||
@ -716,8 +716,8 @@
|
||||
<span class="line"><span style="--shiki-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></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-d4a0bba5><!--[--><!--]--><div class="edit-info" data-v-d4a0bba5><!----><div class="last-updated" data-v-d4a0bba5><p class="VPLastUpdated" data-v-d4a0bba5 data-v-7e05ebdb>上次更新: <time datetime="2024-07-22T06:16:34.000Z" data-v-7e05ebdb></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-d4a0bba5><span class="visually-hidden" id="doc-footer-aria-label" data-v-d4a0bba5>Pager</span><div class="pager" data-v-d4a0bba5><a class="VPLink link pager-link prev" href="/c/notes/01_c-basic/03_xdx/" data-v-d4a0bba5><!--[--><span class="desc" data-v-d4a0bba5>上一篇</span><span class="title" data-v-d4a0bba5>数据类型和运算符</span><!--]--></a></div><div class="pager" data-v-d4a0bba5><a class="VPLink link pager-link next" href="/c/notes/01_c-basic/05_xdx/" data-v-d4a0bba5><!--[--><span class="desc" data-v-d4a0bba5>下一篇</span><span class="title" data-v-d4a0bba5>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>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-d4a0bba5><!--[--><!--]--><div class="edit-info" data-v-d4a0bba5><!----><div class="last-updated" data-v-d4a0bba5><p class="VPLastUpdated" data-v-d4a0bba5 data-v-7e05ebdb>上次更新: <time datetime="2024-07-22T06:58:50.000Z" data-v-7e05ebdb></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-d4a0bba5><span class="visually-hidden" id="doc-footer-aria-label" data-v-d4a0bba5>Pager</span><div class="pager" data-v-d4a0bba5><a class="VPLink link pager-link prev" href="/c/notes/01_c-basic/03_xdx/" data-v-d4a0bba5><!--[--><span class="desc" data-v-d4a0bba5>上一篇</span><span class="title" data-v-d4a0bba5>数据类型和运算符</span><!--]--></a></div><div class="pager" data-v-d4a0bba5><a class="VPLink link pager-link next" href="/c/notes/01_c-basic/05_xdx/" data-v-d4a0bba5><!--[--><span class="desc" data-v-d4a0bba5>下一篇</span><span class="title" data-v-d4a0bba5>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>
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