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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":1721691601000}'),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>
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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.DJkVOkw7.png",y="/c/assets/11.Bkdbe2NL.png",F="/c/assets/12.D2yeCvfw.png",H=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":1721701891000}'),b={name:"notes/01_c-basic/04_xdx/index.md"},u=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>
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<span class="line"></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">int</span><span style="--shiki-light:#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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@ -262,7 +262,7 @@ import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";
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<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> printf</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"票价: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">%.2lf\\n</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">"</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, price);</span></span>
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<span class="line"></span>
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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><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br></div></div><h1 id="第四章-随机数" tabindex="-1">第四章：随机数 <a class="header-anchor" href="#第四章-随机数" aria-label="Permalink to "第四章：随机数""></a></h1><h2 id="_4-1-概述" tabindex="-1">4.1 概述 <a class="header-anchor" href="#_4-1-概述" aria-label="Permalink to "4.1 概述""></a></h2><ul><li>所谓的随机数就是没有规则，并且不能预测的一些数字，也称为真随机数。</li><li>程序中也是可以产生随机数的，但是是通过一些固定规则产生的，称为伪随机数。</li><li>常见的伪随机数（线性同余发生器，LCG）的公式，如下所示：</li></ul>`,84),u={class:"MathJax",jax:"SVG",style:{direction:"ltr",position:"relative"}},o={style:{overflow:"visible","min-height":"1px","min-width":"1px","vertical-align":"-0.566ex"},xmlns:"http://www.w3.org/2000/svg",width:"29.977ex",height:"2.262ex",role:"img",focusable:"false",viewBox:"0 -750 13250 1000","aria-hidden":"true"},m=i('<g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="5B" d="M118 -250V750H255V710H158V-210H255V-250H118Z" style="stroke-width:3;"></path></g><g data-mml-node="msub" transform="translate(278,0)"><g data-mml-node="mi"><path data-c="1D44B" d="M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 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<ul><li>从初始种子开始，通过公式不断生成新的随机数。</li><li>每次迭代都使用前一次生成的随机数作为输入。</li></ul></li></ul></li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>如果种子的值相同，那么每次生成的随机数将相同，解决方案就是将种子的值设置为当前的时间戳。</p></div><h2 id="_4-2-c-语言中随机数的产生" tabindex="-1">4.2 C 语言中随机数的产生 <a class="header-anchor" href="#_4-2-c-语言中随机数的产生" aria-label="Permalink to "4.2 C 语言中随机数的产生""></a></h2><ul><li>① 设置随机数种子：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" 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:#6F42C1;--shiki-dark:#B392F0;">srand</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">10</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // seed 种⼦ rand random 随机</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>随机数函数在 <code>#include <stdlib.h></code> 中声明。</p></div><ul><li>② 根据随机数种⼦计算出⼀个伪随机数：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 根据种⼦值产⽣⼀个 0-32767 范围的随机数</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></div></div><h1 id="第四章-随机数" tabindex="-1">第四章：随机数 <a class="header-anchor" href="#第四章-随机数" aria-label="Permalink to "第四章：随机数""></a></h1><h2 id="_4-1-概述" tabindex="-1">4.1 概述 <a class="header-anchor" href="#_4-1-概述" aria-label="Permalink to "4.1 概述""></a></h2><ul><li>所谓的随机数就是没有规则，并且不能预测的一些数字，也称为真随机数。</li><li>程序中也是可以产生随机数的，但是是通过一些固定规则产生的，称为伪随机数。</li><li>常见的伪随机数（线性同余发生器，LCG）的公式，如下所示：</li></ul>`,84),o={class:"MathJax",jax:"SVG",style:{direction:"ltr",position:"relative"}},m={style:{overflow:"visible","min-height":"1px","min-width":"1px","vertical-align":"-0.566ex"},xmlns:"http://www.w3.org/2000/svg",width:"29.977ex",height:"2.262ex",role:"img",focusable:"false",viewBox:"0 -750 13250 1000","aria-hidden":"true"},C=i('<g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="5B" d="M118 -250V750H255V710H158V-210H255V-250H118Z" style="stroke-width:3;"></path></g><g data-mml-node="msub" transform="translate(278,0)"><g data-mml-node="mi"><path data-c="1D44B" d="M42 0H40Q26 0 26 11Q26 15 29 27Q33 41 36 43T55 46Q141 49 190 98Q200 108 306 224T411 342Q302 620 297 625Q288 636 234 637H206Q200 643 200 645T202 664Q206 677 212 683H226Q260 681 347 681Q380 681 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0px",border:"0px",display:"block",width:"auto",overflow:"hidden"}},[s("math",{xmlns:"http://www.w3.org/1998/Math/MathML"},[s("mo",{stretchy:"false"},"["),s("msub",null,[s("mi",null,"X"),s("mrow",{"data-mjx-texclass":"ORD"},[s("mi",null,"n"),s("mo",null,"+"),s("mn",null,"1")])]),s("mo",null,"="),s("mo",{stretchy:"false"},"("),s("mi",null,"a"),s("mo",null,"⋅"),s("msub",null,[s("mi",null,"X"),s("mi",null,"n")]),s("mo",null,"+"),s("mi",null,"c"),s("mo",{stretchy:"false"},")"),s("mspace",{width:"0.667em"}),s("mi",null,"mod"),s("mstyle",{scriptlevel:"0"},[s("mspace",{width:"0.167em"})]),s("mstyle",{scriptlevel:"0"},[s("mspace",{width:"0.167em"})]),s("mi",null,"m"),s("mo",{stretchy:"false"},"]")])],-1),D=i(`<ul><li>其中，X 是伪随机序列，a 是乘数（通常选择一个大于 0 的常数，典型值有 1664525），c 是增量（选择一个大于0的常数，典型值有1013904223）， m 是模数（ 通常选择一个大的常数，常见值有 ( 2^{32} ) ，即 4294967296））。</li><li>工作原理： <ul><li>① 设置初始种子（X_0）： <ul><li>种子值是算法生成随机数序列的起点。</li><li>不同的种子值会产生不同的随机数序列。</li></ul></li><li>② 递归生成随机数： <ul><li>从初始种子开始，通过公式不断生成新的随机数。</li><li>每次迭代都使用前一次生成的随机数作为输入。</li></ul></li></ul></li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>如果种子的值相同，那么每次生成的随机数将相同，解决方案就是将种子的值设置为当前的时间戳。</p></div><h2 id="_4-2-c-语言中随机数的产生" tabindex="-1">4.2 C 语言中随机数的产生 <a class="header-anchor" href="#_4-2-c-语言中随机数的产生" aria-label="Permalink to "4.2 C 语言中随机数的产生""></a></h2><ul><li>① 设置随机数种子：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" 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:#6F42C1;--shiki-dark:#B392F0;">srand</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">10</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // seed 种⼦ rand random 随机</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>随机数函数在 <code>#include <stdlib.h></code> 中声明。</p></div><ul><li>② 根据随机数种⼦计算出⼀个伪随机数：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 根据种⼦值产⽣⼀个 0-32767 范围的随机数</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> result </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> rand</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">();</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li>③ 产生一个指定范围内的随机数：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">int</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> random_in_range</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">int</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;"> min</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">int</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;"> max</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> rand</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">%</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (max </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">-</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> min </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> min;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><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>
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@ -522,7 +522,7 @@ import{_ as l,c as a,j as s,a5 as i,o as n}from"./chunks/framework.BE8if9e6.js";
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> for</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(初始化语句③; 循环条件语句④; 迭代语句⑥) {</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> 循环体语句⑤;</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
|
||||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>其中，for 、while 、do-while 均可以作为外层循环或内层循环。 <ul><li>外层循环：循环结构 A</li><li>内层循环：循环结构 B</li></ul></li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 实际上，嵌套循环就是将内层循环当成外层循环的循环体。当只有内层循环的循环条件为 false ，才会完全跳出内层循环，才可结束外层的当次循环，开始下一次循环。</li><li>② 假设外层循环次数为 m 次，内层循环次数为 n 次，则内层循环体实际上需要执行 m × n 次。</li><li>③ 从二维图形的角度看，外层循环控制<code>行数</code>，内层循环控制<code>列数</code>。</li><li>④ 实际开发中，我们最多见到的嵌套循环是两层，一般不会出现超过三层的嵌套循环。如果将要出现，一定要停下来重新梳理业务逻辑，重新思考算法的实现，控制在三层以内；否则，可读性会很差。</li></ul></div><h3 id="_5-5-2-应用示例" tabindex="-1">5.5.2 应用示例 <a class="header-anchor" href="#_5-5-2-应用示例" aria-label="Permalink to "5.5.2 应用示例""></a></h3><ul><li><p>需求：打印 5 行 <code>*</code> ，要求每行 6 个 <code>*</code> 。</p></li><li><p>示例：</p></li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> <stdio.h></span></span>
|
||||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>其中，for 、while 、do-while 均可以作为外层循环或内层循环。 <ul><li>外层循环：循环结构 A</li><li>内层循环：循环结构 B</li></ul></li></ul><p><img src="`+c+`" alt=""></p><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 实际上，嵌套循环就是将内层循环当成外层循环的循环体。当只有内层循环的循环条件为 false ，才会完全跳出内层循环，才可结束外层的当次循环，开始下一次循环。</li><li>② 假设外层循环次数为 m 次，内层循环次数为 n 次，则内层循环体实际上需要执行 m × n 次。</li><li>③ 从二维图形的角度看，外层循环控制<code>行数</code>，内层循环控制<code>列数</code>。</li><li>④ 实际开发中，我们最多见到的嵌套循环是两层，一般不会出现超过三层的嵌套循环。如果将要出现，一定要停下来重新梳理业务逻辑，重新思考算法的实现，控制在三层以内；否则，可读性会很差。</li></ul></div><h3 id="_5-5-2-应用示例" tabindex="-1">5.5.2 应用示例 <a class="header-anchor" href="#_5-5-2-应用示例" aria-label="Permalink to "5.5.2 应用示例""></a></h3><ul><li><p>需求：打印 5 行 <code>*</code> ，要求每行 6 个 <code>*</code> 。</p></li><li><p>示例：</p></li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> <stdio.h></span></span>
|
||||
<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>
|
||||
@ -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 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 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="`+y+`" 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 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 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="`+F+`" 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>
|
||||
@ -694,4 +694,4 @@ 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></div></div>`,120);function D(v,q,f,Q,T,_){return n(),a("div",null,[b,s("p",null,[s("mjx-container",u,[(n(),a("svg",o,C)),B])]),A])}const H=l(F,[["render",D]]);export{w as __pageData,H as default};
|
||||
<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>`,121);function v(q,f,Q,T,_,x){return n(),a("div",null,[u,s("p",null,[s("mjx-container",o,[(n(),a("svg",m,B)),A])]),D])}const P=l(b,[["render",v]]);export{H as __pageData,P as default};
|
||||
1
assets/notes_01_c-basic_04_xdx_index.md.lfDB99hY.lean.js
Normal file
1
assets/notes_01_c-basic_04_xdx_index.md.lfDB99hY.lean.js
Normal file
@ -0,0 +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:#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></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="2024-07-23T01:24:54.000Z" 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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> for</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(初始化语句③; 循环条件语句④; 迭代语句⑥) {</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> 循环体语句⑤;</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></div></div><ul><li>其中，for 、while 、do-while 均可以作为外层循环或内层循环。 <ul><li>外层循环：循环结构 A</li><li>内层循环：循环结构 B</li></ul></li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 实际上，嵌套循环就是将内层循环当成外层循环的循环体。当只有内层循环的循环条件为 false ，才会完全跳出内层循环，才可结束外层的当次循环，开始下一次循环。</li><li>② 假设外层循环次数为 m 次，内层循环次数为 n 次，则内层循环体实际上需要执行 m × n 次。</li><li>③ 从二维图形的角度看，外层循环控制<code>行数</code>，内层循环控制<code>列数</code>。</li><li>④ 实际开发中，我们最多见到的嵌套循环是两层，一般不会出现超过三层的嵌套循环。如果将要出现，一定要停下来重新梳理业务逻辑，重新思考算法的实现，控制在三层以内；否则，可读性会很差。</li></ul></div><h3 id="_5-5-2-应用示例" tabindex="-1">5.5.2 应用示例 <a class="header-anchor" href="#_5-5-2-应用示例" aria-label="Permalink to "5.5.2 应用示例""></a></h3><ul><li><p>需求：打印 5 行 <code>*</code> ，要求每行 6 个 <code>*</code> 。</p></li><li><p>示例：</p></li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> <stdio.h></span></span>
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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></div></div><ul><li>其中，for 、while 、do-while 均可以作为外层循环或内层循环。 <ul><li>外层循环：循环结构 A</li><li>内层循环：循环结构 B</li></ul></li></ul><p><img src="/c/assets/10.DJkVOkw7.png" alt=""></p><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 实际上，嵌套循环就是将内层循环当成外层循环的循环体。当只有内层循环的循环条件为 false ，才会完全跳出内层循环，才可结束外层的当次循环，开始下一次循环。</li><li>② 假设外层循环次数为 m 次，内层循环次数为 n 次，则内层循环体实际上需要执行 m × n 次。</li><li>③ 从二维图形的角度看，外层循环控制<code>行数</code>，内层循环控制<code>列数</code>。</li><li>④ 实际开发中，我们最多见到的嵌套循环是两层，一般不会出现超过三层的嵌套循环。如果将要出现，一定要停下来重新梳理业务逻辑，重新思考算法的实现，控制在三层以内；否则，可读性会很差。</li></ul></div><h3 id="_5-5-2-应用示例" tabindex="-1">5.5.2 应用示例 <a class="header-anchor" href="#_5-5-2-应用示例" aria-label="Permalink to "5.5.2 应用示例""></a></h3><ul><li><p>需求：打印 5 行 <code>*</code> ，要求每行 6 个 <code>*</code> 。</p></li><li><p>示例：</p></li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> <stdio.h></span></span>
|
||||
<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>
|
||||
@ -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 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 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/11.Bkdbe2NL.png" alt=""></p><ul><li>示例：打印 0 ~ 10 ，如果遇到 <code>3</code> ，就停止打印</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> <stdio.h></span></span>
|
||||
<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 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 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/12.D2yeCvfw.png" alt=""></p><ul><li>示例：打印 0 ~ 10 ，如果遇到 <code>3</code> ，就继续下一次打印</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> <stdio.h></span></span>
|
||||
<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="2024-07-22T23:40:01.000Z" 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="2024-07-23T02:31:31.000Z" 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/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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data-v-b8d55f3b></div><a class="VPLink link link" href="/c/notes/01_c-basic/05_xdx/" data-v-b8d55f3b><!--[--><p class="text" data-v-b8d55f3b>数组</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b8d55f3b data-v-b8d55f3b><div class="item" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><a class="VPLink link link" href="/c/notes/01_c-basic/06_xdx/" data-v-b8d55f3b><!--[--><p class="text" data-v-b8d55f3b>函数</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b8d55f3b data-v-b8d55f3b><div class="item" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><a class="VPLink link link" href="/c/notes/01_c-basic/07_xdx/" data-v-b8d55f3b><!--[--><p class="text" data-v-b8d55f3b>指针</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b8d55f3b data-v-b8d55f3b><div class="item" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><a class="VPLink link link" href="/c/notes/01_c-basic/08_xdx/" data-v-b8d55f3b><!--[--><p class="text" data-v-b8d55f3b>预处理器</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b8d55f3b data-v-b8d55f3b><div class="item" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><a class="VPLink link link" href="/c/notes/01_c-basic/09_xdx/" data-v-b8d55f3b><!--[--><p class="text" data-v-b8d55f3b>自定义数据类型</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b8d55f3b data-v-b8d55f3b><div class="item" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><a class="VPLink link link" href="/c/notes/01_c-basic/10_xdx/" data-v-b8d55f3b><!--[--><p class="text" data-v-b8d55f3b>字符串和时间</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b8d55f3b data-v-b8d55f3b><div class="item" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><a class="VPLink link link" href="/c/notes/01_c-basic/11_xdx/" data-v-b8d55f3b><!--[--><p class="text" data-v-b8d55f3b>内存管理</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b8d55f3b data-v-b8d55f3b><div class="item" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><a class="VPLink link link" href="/c/notes/01_c-basic/12_xdx/" data-v-b8d55f3b><!--[--><p class="text" data-v-b8d55f3b>文件操作</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-575e6a36><div class="VPSidebarItem level-0 collapsible collapsed" data-v-575e6a36 data-v-b8d55f3b><div class="item" role="button" tabindex="0" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><p class="text" data-v-b8d55f3b>C 语言高级</p><!----></div><!----></div></div><div class="group" data-v-575e6a36><div class="VPSidebarItem level-0 collapsible collapsed" data-v-575e6a36 data-v-b8d55f3b><div class="item" role="button" tabindex="0" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><p class="text" data-v-b8d55f3b>C++ 核心编程</p><!----></div><!----></div></div><div class="group" data-v-575e6a36><div class="VPSidebarItem level-0 collapsible collapsed" data-v-575e6a36 data-v-b8d55f3b><div class="item" role="button" tabindex="0" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><p class="text" data-v-b8d55f3b>C++ 标准库</p><!----></div><!----></div></div><div class="group" data-v-575e6a36><div class="VPSidebarItem level-0 collapsible collapsed" data-v-575e6a36 data-v-b8d55f3b><div class="item" role="button" tabindex="0" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><p class="text" data-v-b8d55f3b>QT 桌面开发</p><!----></div><!----></div></div><div class="group" data-v-575e6a36><div class="VPSidebarItem level-0 collapsible collapsed" data-v-575e6a36 data-v-b8d55f3b><div class="item" role="button" tabindex="0" data-v-b8d55f3b><div class="indicator" data-v-b8d55f3b></div><p class="text" data-v-b8d55f3b>Linux 高并发服务器开发</p><!----></div><!----></div></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-5d98c3a5 data-v-1428d186><div class="VPDoc has-sidebar has-aside" data-v-1428d186 data-v-39a288b8><!--[--><!--]--><div class="container" data-v-39a288b8><div class="aside" data-v-39a288b8><div class="aside-curtain" data-v-39a288b8></div><div class="aside-container" data-v-39a288b8><div class="aside-content" data-v-39a288b8><div class="VPDocAside" data-v-39a288b8 data-v-3f215769><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-3f215769 data-v-a5bbad30><div class="content" data-v-a5bbad30><div class="outline-marker" data-v-a5bbad30></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-a5bbad30>目录</div><ul class="VPDocOutlineItem root" data-v-a5bbad30 data-v-b933a997><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" 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