deploy: 1383ab55bc

2024-10-22 14:05:45 +02:00 · 2024-08-26 04:29:02 +00:00 · 2024-08-26 04:29:02 +00:00 · 3ee0741ccb
commit 3ee0741ccb
parent 7198148cd9
20 changed files with 47 additions and 47 deletions
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id="第一章-数据类型-⭐" tabindex="-1">第一章：数据类型（⭐） <a class="header-anchor" href="#第一章-数据类型-⭐" aria-label="Permalink to &quot;第一章：数据类型（⭐）&quot;"></a></h1><h2 id="_1-1-概述" tabindex="-1">1.1 概述 <a class="header-anchor" href="#_1-1-概述" aria-label="Permalink to &quot;1.1 概述&quot;"></a></h2><ul><li><p>根据<code>变量</code>中<code>存储</code>的<code>值</code>的<code>不同</code>，我们可以将<code>变量</code>分为两类：</p><ul><li><code>普通变量</code>：变量所对应的内存中存储的是<code>普通值</code>。</li><li><code>指针变量</code>：变量所对应的内存中存储的是<code>另一个变量的地址</code>。</li></ul></li><li><p>如下图所示：</p></li></ul><p><img src="'+t+'" alt="" loading="lazy"></p><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>普通变量和指针变量的相同点：</p><ul><li>普通变量有内存空间，指针变量也有内存空间。</li><li>普通变量有内存地址，指针变量也有内存地址。</li><li>普通变量所对应的内存空间中有值，指针变量所对应的内存空间中也有值。</li></ul><p>普通变量和指针变量的不同点：</p><ul><li>普通变量所对应的内存空间存储的是普通的值，如：整数、小数、字符等；指针变量所对应的内存空间存储的是另外一个变量的地址。</li><li>普通变量有普通变量的运算方式，而指针变量有指针变量的运算方式（后续讲解）。</li></ul></div><ul><li>那么，在 C 语言中变量的数据类型就可以这么划分，如下所示：</li></ul><p><img src="'+h+`" alt="" loading="lazy"></p><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>根据<code>普通变量</code>中<code>存储</code>的<code>值</code>的类型不同，可以将<code>普通变量类型</code>划分为<code>基本数据类型</code>（整型、字符类型、浮点类型、布尔类型）和<code>复合数据类型</code>（数组类型、结构体类型、共用体类型、枚举类型）。</li><li>根据<code>指针变量</code>所<code>指向空间</code>中<code>存储</code>的<code>值</code>的类型不同，可以将<code>指针类型</code>分为<code>基本数据类型指针</code>、<code>复合数据类型指针</code>、<code>函数指针</code>、<code>数组指针</code>等，例如：如果指针所指向的空间保存的是 int 类型，那么该指针就是 int 类型的指针。</li></ul></div><h2 id="_1-2-整数类型" tabindex="-1">1.2 整数类型 <a class="header-anchor" href="#_1-2-整数类型" aria-label="Permalink to &quot;1.2 整数类型&quot;"></a></h2><h3 id="_1-2-1-概述" tabindex="-1">1.2.1 概述 <a class="header-anchor" href="#_1-2-1-概述" aria-label="Permalink to &quot;1.2.1 概述&quot;"></a></h3><ul><li>整数类型简称整型，用于存储整数值，如：12、20、50 等。</li><li>根据所占<code>内存空间</code>大小的不同，可以将整数类型划分为：</li><li>① 短整型：</li></ul><table tabindex="0"><thead><tr><th>类型</th><th>存储空间（内存空间）</th><th>取值范围</th></tr></thead><tbody><tr><td>unsigned short （无符号短整型）</td><td>2 字节</td><td>0 ~ 65,535 (2^16 - 1)</td></tr><tr><td>[signed] short（有符号短整型，默认）</td><td>2 字节</td><td>-32,768 (- 2^15) ~ 32,767 (2^15 -1)</td></tr></tbody></table><ul><li>② 整型：</li></ul><table tabindex="0"><thead><tr><th>类型</th><th>存储空间（内存空间）</th><th>取值范围</th></tr></thead><tbody><tr><td>unsigned int（无符号整型）</td><td>4 字节（通常）</td><td>0 ~ 4294967295 (0 ~2^32 -1)</td></tr><tr><td>[signed] int（有符号整型，默认）</td><td>4 字节（通常）</td><td>-2147483648（- 2^31） ~ 2147483647 (2^31-1)</td></tr></tbody></table><ul><li>③ 长整型：</li></ul><table tabindex="0"><thead><tr><th>类型</th><th>存储空间（内存空间）</th><th>取值范围</th></tr></thead><tbody><tr><td>unsigned long（无符号长整型）</td><td>4 字节（通常）</td><td>0 ~2^32 -1</td></tr><tr><td>[signed] long（有符号长整型，默认）</td><td>4 字节（通常）</td><td>- 2^31 ~ 2^31-1</td></tr></tbody></table><ul><li>④ 长长整型：</li></ul><table tabindex="0"><thead><tr><th>类型</th><th>存储空间（内存空间）</th><th>取值范围</th></tr></thead><tbody><tr><td>unsigned long long（无符号长整型）</td><td>8 字节（通常）</td><td>0 ~2^64 -1</td></tr><tr><td>[signed] long long（有符号长整型，默认）</td><td>8 字节（通常）</td><td>- 2^63 ~ 2^63-1</td></tr></tbody></table><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><ul><li><p>① 数据类型在内存中占用的存储单元（字节数），就称为该数据类型的长度（步长），如：short 占用 2 个字节的内存，就称 short 的长度（步长）是 2。</p></li><li><p>② C 语言并没有严格规定各种整数数据类型在内存中所占存储单元的长度，只做了宽泛的限制：</p><ul><li>short 至少占用 2 个字节的存储单元。</li><li>int 建议为一个机器字长（指计算机的处理器在一次操作中能够处理的二进制数据的位数，机器字长是处理器的“字”长度，它决定了处理器在一个时钟周期内能够处理的数据量，如：早期的计算机的处理器通常是 8 位的机器字长，意味着处理器一次只能处理 8 位（二进制）数据；之后的计算机的处理器有 16 位的机器字长，意味着处理器一次可以处理 16 位的数据；再之后计算机的处理器有 32 位或 64 位的机器字长，意味着处理器一次可以处理 32 位或 64位的数据）。即：32 位环境下 int 占用 4 个字节的存储单元，64 位环境下 int 占用 8 个字节的存储单元。</li><li>short 的长度（步长）不能大于 int，long 的长度（步长）不能小于 int，long long 不能小于 long。</li></ul></li><li><p>③ 那么，各种整数数据类型在内存中所占存储单元的长度的公式就是 <code>2 ≤ sizeof(short) ≤ sizeof(int) ≤ sizeof(long) ≤ sizeof(long long)</code>，具体的存储空间由编译系统自行决定。其中，<code>sizeof</code> 是测量类型或变量、常量长度的<code>运算符</code>。</p></li></ul></div><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><ul><li>① 之所以这么规定，是为了可以让 C 语言长久使用，因为目前主流的 CPU 都是 64 位，但是在 C 语言刚刚出现的时候，CPU 还是以 8 位和 16 位为主。如果当时就将整型定死为 8 位或 16 位，那么现在我们肯定不会再学习 C 语言了。</li><li>② 整型分为有符号 signed 和无符号 unsigned 两种，默认是 signed。</li><li>③ 在实际开发中，<code>最常用的整数类型</code>就是 <code>int</code> 类型了，如果取值范围不够，就使用 long 或 long long 。</li><li>④ C 语言中的<code>格式占位符</code>非常多，只需要大致了解即可；因为，我们在实际开发中，一般都会使用 C++ 或 Rust 以及其它的高级编程语言，如：Java 等，早已经解决了必须通过<code>格式占位符</code>来才能将变量进行输入和输出。</li></ul></div><h3 id="_1-2-2-短整型-了解" tabindex="-1">1.2.2 短整型（了解） <a class="header-anchor" href="#_1-2-2-短整型-了解" aria-label="Permalink to &quot;1.2.2 短整型（了解）&quot;"></a></h3><ul><li>语法：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">unsigned</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> short</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 10</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ;</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 无符号短整型</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">short</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> -</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">10</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 有符号短整型</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 有符号表示的是正数、负数和 0 ，即有正负号。无符号表示的是 0 和正数，即正整数，没有符号。</li><li>② 在 <code>printf</code> 中<code>无符号短整型（unsigned short）</code>的<code>格式占位符</code>是 <code>%hu</code> ，<code>有符号短整型（signed short）</code>的<code>格式占位符</code>是 <code>%hd</code> 。</li><li>③ 可以通过 <code>sizeof</code> 运算符获取<code>无符号短整型（unsigned short）</code> 和 <code>有符号短整型（signed short）</code> 的<code>存储空间（所占内存空间）</code>。</li><li>③ 可以通过 <code>#include &lt;limits.h&gt;</code> 来获取 <code>无符号短整型（unsigned short）</code> 和<code>有符号短整型（signed short）</code>的<code>取值范围</code>。</li></ul></div><ul><li>示例：定义和打印短整型变量</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &lt;stdio.h&gt;</span></span>
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t="/c/assets/1.L8V3GBrc.png",h="/c/assets/2.nqdAY_P3.png",e="/c/assets/3.D7eNbwzQ.jpg",k="/c/assets/4.DElD8M7P.svg",d="/c/assets/5.BE2mwvAQ.svg",r="/c/assets/6.aMDLQtj3.svg",c="/c/assets/7.eAeDlr0I.svg",E="/c/assets/8.CiYoL9Pa.svg",g="/c/assets/9.f3_OgcWU.svg",o="/c/assets/10.Dx5GM3xz.svg",F="/c/assets/11.DNH2vSdC.svg",y="/c/assets/12.NlBmD7pA.png",u="/c/assets/13.ZiBq6Pno.png",b="/c/assets/14.DAgmsf-w.png",m="/c/assets/15.B2iC37fw.png",C="/c/assets/16.BlE3ZFud.png",A="/c/assets/17.CBpay1zM.svg",B="/c/assets/18.g66usGgc.svg",D="/c/assets/19.BW4hoq9o.svg",v="/c/assets/20.DBXyt0gx.svg",T="/c/assets/21.QOjKI_7K.svg",Q="/c/assets/22.BPFvANo_.svg",f="/c/assets/23.BSJo8a0j.svg",q="/c/assets/24.r8ZG8Rvh.svg",_="/c/assets/25.rY0SPMAM.svg",x="/c/assets/26.CX-aIacs.svg",w="/c/assets/27.B6oI9aDx.svg",L="/c/assets/28.BK--PMbQ.svg",z="/c/assets/29.CJ87msb8.svg",H="/c/assets/30.CjsU-QJv.svg",M="/c/assets/31.s4BF2CMv.svg",P="/c/assets/32.DCGI6iJG.svg",I="/c/assets/33.C1jQxCuu.svg",N="/c/assets/35.CGTVELeO.png",V="/c/assets/36.Bz4_lEH0.gif",S="/c/assets/37.CcDWE4nn.png",O="/c/assets/38.B7y2_JVX.gif",U="/c/assets/39.Btcc3rs2.gif",Z="/c/assets/40.CR4ARW8y.png",R="/c/assets/39.Btcc3rs2.gif",j="/c/assets/42.DOX3ymYP.gif",G="/c/assets/43.Cie9_tkP.gif",J="/c/assets/44.DLjH9Ges.png",ys=JSON.parse('{"title":"第一章：数据类型（⭐）","description":"","frontmatter":{},"headers":[],"relativePath":"notes/01_c-basic/03_xdx/index.md","filePath":"notes/01_c-basic/03_xdx/index.md","lastUpdated":1724646501000}'),X={name:"notes/01_c-basic/03_xdx/index.md"},W=a('<h1 id="第一章-数据类型-⭐" tabindex="-1">第一章：数据类型（⭐） <a class="header-anchor" href="#第一章-数据类型-⭐" aria-label="Permalink to &quot;第一章：数据类型（⭐）&quot;"></a></h1><h2 id="_1-1-概述" tabindex="-1">1.1 概述 <a class="header-anchor" href="#_1-1-概述" aria-label="Permalink to &quot;1.1 概述&quot;"></a></h2><ul><li><p>根据<code>变量</code>中<code>存储</code>的<code>值</code>的<code>不同</code>，我们可以将<code>变量</code>分为两类：</p><ul><li><code>普通变量</code>：变量所对应的内存中存储的是<code>普通值</code>。</li><li><code>指针变量</code>：变量所对应的内存中存储的是<code>另一个变量的地址</code>。</li></ul></li><li><p>如下图所示：</p></li></ul><p><img src="'+t+'" alt="" loading="lazy"></p><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>普通变量和指针变量的相同点：</p><ul><li>普通变量有内存空间，指针变量也有内存空间。</li><li>普通变量有内存地址，指针变量也有内存地址。</li><li>普通变量所对应的内存空间中有值，指针变量所对应的内存空间中也有值。</li></ul><p>普通变量和指针变量的不同点：</p><ul><li>普通变量所对应的内存空间存储的是普通的值，如：整数、小数、字符等；指针变量所对应的内存空间存储的是另外一个变量的地址。</li><li>普通变量有普通变量的运算方式，而指针变量有指针变量的运算方式（后续讲解）。</li></ul></div><ul><li>那么，在 C 语言中变量的数据类型就可以这么划分，如下所示：</li></ul><p><img src="'+h+`" alt="" loading="lazy"></p><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>根据<code>普通变量</code>中<code>存储</code>的<code>值</code>的类型不同，可以将<code>普通变量类型</code>划分为<code>基本数据类型</code>（整型、字符类型、浮点类型、布尔类型）和<code>复合数据类型</code>（数组类型、结构体类型、共用体类型、枚举类型）。</li><li>根据<code>指针变量</code>所<code>指向空间</code>中<code>存储</code>的<code>值</code>的类型不同，可以将<code>指针类型</code>分为<code>基本数据类型指针</code>、<code>复合数据类型指针</code>、<code>函数指针</code>、<code>数组指针</code>等，例如：如果指针所指向的空间保存的是 int 类型，那么该指针就是 int 类型的指针。</li></ul></div><h2 id="_1-2-整数类型" tabindex="-1">1.2 整数类型 <a class="header-anchor" href="#_1-2-整数类型" aria-label="Permalink to &quot;1.2 整数类型&quot;"></a></h2><h3 id="_1-2-1-概述" tabindex="-1">1.2.1 概述 <a class="header-anchor" href="#_1-2-1-概述" aria-label="Permalink to &quot;1.2.1 概述&quot;"></a></h3><ul><li>整数类型简称整型，用于存储整数值，如：12、20、50 等。</li><li>根据所占<code>内存空间</code>大小的不同，可以将整数类型划分为：</li><li>① 短整型：</li></ul><table tabindex="0"><thead><tr><th>类型</th><th>存储空间（内存空间）</th><th>取值范围</th></tr></thead><tbody><tr><td>unsigned short （无符号短整型）</td><td>2 字节</td><td>0 ~ 65,535 (2^16 - 1)</td></tr><tr><td>[signed] short（有符号短整型，默认）</td><td>2 字节</td><td>-32,768 (- 2^15) ~ 32,767 (2^15 -1)</td></tr></tbody></table><ul><li>② 整型：</li></ul><table tabindex="0"><thead><tr><th>类型</th><th>存储空间（内存空间）</th><th>取值范围</th></tr></thead><tbody><tr><td>unsigned int（无符号整型）</td><td>4 字节（通常）</td><td>0 ~ 4294967295 (0 ~2^32 -1)</td></tr><tr><td>[signed] int（有符号整型，默认）</td><td>4 字节（通常）</td><td>-2147483648（- 2^31） ~ 2147483647 (2^31-1)</td></tr></tbody></table><ul><li>③ 长整型：</li></ul><table tabindex="0"><thead><tr><th>类型</th><th>存储空间（内存空间）</th><th>取值范围</th></tr></thead><tbody><tr><td>unsigned long（无符号长整型）</td><td>4 字节（通常）</td><td>0 ~2^32 -1</td></tr><tr><td>[signed] long（有符号长整型，默认）</td><td>4 字节（通常）</td><td>- 2^31 ~ 2^31-1</td></tr></tbody></table><ul><li>④ 长长整型：</li></ul><table tabindex="0"><thead><tr><th>类型</th><th>存储空间（内存空间）</th><th>取值范围</th></tr></thead><tbody><tr><td>unsigned long long（无符号长整型）</td><td>8 字节（通常）</td><td>0 ~2^64 -1</td></tr><tr><td>[signed] long long（有符号长整型，默认）</td><td>8 字节（通常）</td><td>- 2^63 ~ 2^63-1</td></tr></tbody></table><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><ul><li><p>① 数据类型在内存中占用的存储单元（字节数），就称为该数据类型的长度（步长），如：short 占用 2 个字节的内存，就称 short 的长度（步长）是 2。</p></li><li><p>② C 语言并没有严格规定各种整数数据类型在内存中所占存储单元的长度，只做了宽泛的限制：</p><ul><li>short 至少占用 2 个字节的存储单元。</li><li>int 建议为一个机器字长（指计算机的处理器在一次操作中能够处理的二进制数据的位数，机器字长是处理器的“字”长度，它决定了处理器在一个时钟周期内能够处理的数据量，如：早期的计算机的处理器通常是 8 位的机器字长，意味着处理器一次只能处理 8 位（二进制）数据；之后的计算机的处理器有 16 位的机器字长，意味着处理器一次可以处理 16 位的数据；再之后计算机的处理器有 32 位或 64 位的机器字长，意味着处理器一次可以处理 32 位或 64位的数据）。即：32 位环境下 int 占用 4 个字节的存储单元，64 位环境下 int 占用 8 个字节的存储单元。</li><li>short 的长度（步长）不能大于 int，long 的长度（步长）不能小于 int，long long 不能小于 long。</li></ul></li><li><p>③ 那么，各种整数数据类型在内存中所占存储单元的长度的公式就是 <code>2 ≤ sizeof(short) ≤ sizeof(int) ≤ sizeof(long) ≤ sizeof(long long)</code>，具体的存储空间由编译系统自行决定。其中，<code>sizeof</code> 是测量类型或变量、常量长度的<code>运算符</code>。</p></li></ul></div><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><ul><li>① 之所以这么规定，是为了可以让 C 语言长久使用，因为目前主流的 CPU 都是 64 位，但是在 C 语言刚刚出现的时候，CPU 还是以 8 位和 16 位为主。如果当时就将整型定死为 8 位或 16 位，那么现在我们肯定不会再学习 C 语言了。</li><li>② 整型分为有符号 signed 和无符号 unsigned 两种，默认是 signed。</li><li>③ 在实际开发中，<code>最常用的整数类型</code>就是 <code>int</code> 类型了，如果取值范围不够，就使用 long 或 long long 。</li><li>④ C 语言中的<code>格式占位符</code>非常多，只需要大致了解即可；因为，我们在实际开发中，一般都会使用 C++ 或 Rust 以及其它的高级编程语言，如：Java 等，早已经解决了必须通过<code>格式占位符</code>来才能将变量进行输入和输出。</li></ul></div><h3 id="_1-2-2-短整型-了解" tabindex="-1">1.2.2 短整型（了解） <a class="header-anchor" href="#_1-2-2-短整型-了解" aria-label="Permalink to &quot;1.2.2 短整型（了解）&quot;"></a></h3><ul><li>语法：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">unsigned</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> short</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 10</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ;</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 无符号短整型</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">short</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> x </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> -</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">10</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 有符号短整型</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 有符号表示的是正数、负数和 0 ，即有正负号。无符号表示的是 0 和正数，即正整数，没有符号。</li><li>② 在 <code>printf</code> 中<code>无符号短整型（unsigned short）</code>的<code>格式占位符</code>是 <code>%hu</code> ，<code>有符号短整型（signed short）</code>的<code>格式占位符</code>是 <code>%hd</code> 。</li><li>③ 可以通过 <code>sizeof</code> 运算符获取<code>无符号短整型（unsigned short）</code> 和 <code>有符号短整型（signed short）</code> 的<code>存储空间（所占内存空间）</code>。</li><li>③ 可以通过 <code>#include &lt;limits.h&gt;</code> 来获取 <code>无符号短整型（unsigned short）</code> 和<code>有符号短整型（signed short）</code>的<code>取值范围</code>。</li></ul></div><ul><li>示例：定义和打印短整型变量</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &lt;stdio.h&gt;</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>
@ -806,7 +806,7 @@ import{_ as p,c as n,j as s,a as i,a6 as a,o as l}from"./chunks/framework.hMCIpN
 <span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">    printf</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;整数 </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">%d</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> 的二进制表示：</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">%s</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> \\n</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, b, </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">getBinary</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(b));</span></span>
 <span class="line"></span>
 <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">    return</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
-<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br></div></div><h3 id="_2-6-3-按位与" tabindex="-1">2.6.3 按位与 <a class="header-anchor" href="#_2-6-3-按位与" aria-label="Permalink to &quot;2.6.3 按位与&quot;"></a></h3><ul><li><p>按位与 <code>&amp;</code> 的运算规则是：如果二进制对应的位上都是 1 才是 1 ，否则为 0 ，即：</p><ul><li><code>1 &amp; 1</code> 的结果是 <code>1</code> 。</li><li><code>1 &amp; 0</code> 的结果是 <code>0</code> 。</li><li><code>0 &amp; 1</code> 的结果是 <code>0</code> 。</li><li><code>0 &amp; 0</code> 的结果是 <code>0</code> 。</li></ul></li><li><p>示例：<code>9 &amp; 7 = 1</code></p></li></ul><p><img src="`+Q+'" alt="" loading="lazy"></p><ul><li>示例：<code>-9 &amp; 7 = 7</code></li></ul><p><img src="'+f+'" alt="" loading="lazy"></p><h3 id="_2-6-4-按位或" tabindex="-1">2.6.4 按位或 <a class="header-anchor" href="#_2-6-4-按位或" aria-label="Permalink to &quot;2.6.4 按位或&quot;"></a></h3><ul><li><p>按位与 <code>|</code> 的运算规则是：如果二进制对应的位上只要有 1 就是 1 ，否则为 0 ，即：</p><ul><li><code>1 | 1</code> 的结果是 <code>1</code> 。</li><li><code>1 | 0</code> 的结果是 <code>1</code> 。</li><li><code>0 | 1</code> 的结果是 <code>1</code> 。</li><li><code>0 | 0</code> 的结果是 <code>0</code> 。</li></ul></li><li><p>示例：<code>9 | 7 = 15</code></p></li></ul><p><img src="'+q+'" alt="" loading="lazy"></p><ul><li>示例：<code>-9 | 7 = -9</code></li></ul><p><img src="'+_+'" alt="" loading="lazy"></p><h3 id="_2-6-5-按位异或" tabindex="-1">2.6.5 按位异或 <a class="header-anchor" href="#_2-6-5-按位异或" aria-label="Permalink to &quot;2.6.5 按位异或&quot;"></a></h3><ul><li>按位与 <code>^</code> 的运算规则是：如果二进制对应的位上一个为 1 一个为 0 就为 1 ，否则为 0 ，即： <ul><li><code>1 ^ 1</code> 的结果是 <code>0</code> 。</li><li><code>1 ^ 0</code> 的结果是 <code>1</code> 。</li><li><code>0 ^ 1</code> 的结果是 <code>1</code> 。</li><li><code>0 ^ 0</code> 的结果是 <code>0</code> 。</li></ul></li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>按位异或的场景有：</p><ul><li>① 交换两个数值：异或操作可以在不使用临时变量的情况下交换两个变量的值。</li><li>② 加密或解密：异或操作用于简单的加密和解密算法。</li><li>③ 错误检测和校正：异或操作可以用于奇偶校验位的计算和检测错误（RAID-3 以及以上）。</li><li>……</li></ul></div><ul><li>示例：<code>9 ^ 7 = 14</code></li></ul><p><img src="'+x+'" alt="" loading="lazy"></p><ul><li>示例：<code>-9 ^ 7 = -16</code></li></ul><p><img src="'+w+'" alt="" loading="lazy"></p><h3 id="_2-6-6-按位取反" tabindex="-1">2.6.6 按位取反 <a class="header-anchor" href="#_2-6-6-按位取反" aria-label="Permalink to &quot;2.6.6 按位取反&quot;"></a></h3><ul><li><p>运算规则：如果二进制对应的位上是 1，则结果为 0；如果是 0 ，则结果为 1 。</p><ul><li><code>~0</code> 的结果是 <code>1</code> 。</li><li><code>~1</code> 的结果是 <code>0</code> 。</li></ul></li><li><p>示例：<code>~9 = -10</code></p></li></ul><p><img src="'+L+'" alt="" loading="lazy"></p><ul><li>示例：<code>~-9 = 8</code></li></ul><p><img src="'+z+'" alt="" loading="lazy"></p><h3 id="_2-6-7-二进制左移" tabindex="-1">2.6.7 二进制左移 <a class="header-anchor" href="#_2-6-7-二进制左移" aria-label="Permalink to &quot;2.6.7 二进制左移&quot;"></a></h3><ul><li><p>在一定范围内，数据每向左移动一位，相当于原数据 × 2。（正数、负数都适用）</p></li><li><p>示例：<code>3 &lt;&lt; 4 = 48</code> （3 × 2^4）</p></li></ul><p><img src="'+H+'" alt="" loading="lazy"></p><ul><li>示例：<code>-3 &lt;&lt; 4 = -48</code> （-3 × 2 ^4）</li></ul><p><img src="'+P+'" alt="" loading="lazy"></p><h3 id="_2-6-8-二进制右移" tabindex="-1">2.6.8 二进制右移 <a class="header-anchor" href="#_2-6-8-二进制右移" aria-label="Permalink to &quot;2.6.8 二进制右移&quot;"></a></h3><ul><li>在一定范围内，数据每向右移动一位，相当于原数据 ÷ 2。（正数、负数都适用）</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 如果不能整除，则向下取整。</li><li>② 右移运算符最好只用于无符号整数，不要用于负数。因为不同系统对于右移后如何处理负数的符号位，有不同的做法，可能会得到不一样的结果。</li></ul></div><ul><li>示例：<code>69 &gt;&gt; 4 = 4</code> （69 ÷ 2^4 ）</li></ul><p><img src="'+M+'" alt="" loading="lazy"></p><ul><li>示例：<code>-69 &gt;&gt; 4 = -5</code> （-69 ÷ 2^4 ）</li></ul><p><img src="'+I+`" alt="" loading="lazy"></p><h2 id="_2-7-三元运算符" tabindex="-1">2.7 三元运算符 <a class="header-anchor" href="#_2-7-三元运算符" aria-label="Permalink to &quot;2.7 三元运算符&quot;"></a></h2><ul><li>语法：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">条件表达式 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">?</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> 表达式1 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> 表达式2 ;</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>如果条件表达式为非 0 （真），则整个表达式的值是表达式 1 。</li><li>如果条件表达式为 0 （假），则整个表达式的值是表达式 2 。</li></ul></div><ul><li>示例：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &lt;stdio.h&gt;</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></div></div><h3 id="_2-6-3-按位与" tabindex="-1">2.6.3 按位与 <a class="header-anchor" href="#_2-6-3-按位与" aria-label="Permalink to &quot;2.6.3 按位与&quot;"></a></h3><ul><li><p>按位与 <code>&amp;</code> 的运算规则是：如果二进制对应的位上都是 1 才是 1 ，否则为 0 ，即：</p><ul><li><code>1 &amp; 1</code> 的结果是 <code>1</code> 。</li><li><code>1 &amp; 0</code> 的结果是 <code>0</code> 。</li><li><code>0 &amp; 1</code> 的结果是 <code>0</code> 。</li><li><code>0 &amp; 0</code> 的结果是 <code>0</code> 。</li></ul></li><li><p>示例：<code>9 &amp; 7 = 1</code></p></li></ul><p><img src="`+Q+'" alt="" loading="lazy"></p><ul><li>示例：<code>-9 &amp; 7 = 7</code></li></ul><p><img src="'+f+'" alt="" loading="lazy"></p><h3 id="_2-6-4-按位或" tabindex="-1">2.6.4 按位或 <a class="header-anchor" href="#_2-6-4-按位或" aria-label="Permalink to &quot;2.6.4 按位或&quot;"></a></h3><ul><li><p>按位与 <code>|</code> 的运算规则是：如果二进制对应的位上只要有 1 就是 1 ，否则为 0 ，即：</p><ul><li><code>1 | 1</code> 的结果是 <code>1</code> 。</li><li><code>1 | 0</code> 的结果是 <code>1</code> 。</li><li><code>0 | 1</code> 的结果是 <code>1</code> 。</li><li><code>0 | 0</code> 的结果是 <code>0</code> 。</li></ul></li><li><p>示例：<code>9 | 7 = 15</code></p></li></ul><p><img src="'+q+'" alt="" loading="lazy"></p><ul><li>示例：<code>-9 | 7 = -9</code></li></ul><p><img src="'+_+'" alt="" loading="lazy"></p><h3 id="_2-6-5-按位异或" tabindex="-1">2.6.5 按位异或 <a class="header-anchor" href="#_2-6-5-按位异或" aria-label="Permalink to &quot;2.6.5 按位异或&quot;"></a></h3><ul><li>按位与 <code>^</code> 的运算规则是：如果二进制对应的位上一个为 1 一个为 0 就为 1 ，否则为 0 ，即： <ul><li><code>1 ^ 1</code> 的结果是 <code>0</code> 。</li><li><code>1 ^ 0</code> 的结果是 <code>1</code> 。</li><li><code>0 ^ 1</code> 的结果是 <code>1</code> 。</li><li><code>0 ^ 0</code> 的结果是 <code>0</code> 。</li></ul></li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><p>按位异或的场景有：</p><ul><li>① 交换两个数值：异或操作可以在不使用临时变量的情况下交换两个变量的值。</li><li>② 加密或解密：异或操作用于简单的加密和解密算法。</li><li>③ 错误检测和校正：异或操作可以用于奇偶校验位的计算和检测错误（RAID-3 以及以上）。</li><li>……</li></ul></div><ul><li>示例：<code>9 ^ 7 = 14</code></li></ul><p><img src="'+x+'" alt="" loading="lazy"></p><ul><li>示例：<code>-9 ^ 7 = -16</code></li></ul><p><img src="'+w+'" alt="" loading="lazy"></p><h3 id="_2-6-6-按位取反" tabindex="-1">2.6.6 按位取反 <a class="header-anchor" href="#_2-6-6-按位取反" aria-label="Permalink to &quot;2.6.6 按位取反&quot;"></a></h3><ul><li><p>运算规则：如果二进制对应的位上是 1，则结果为 0；如果是 0 ，则结果为 1 。</p><ul><li><code>~0</code> 的结果是 <code>1</code> 。</li><li><code>~1</code> 的结果是 <code>0</code> 。</li></ul></li><li><p>示例：<code>~9 = -10</code></p></li></ul><p><img src="'+L+'" alt="" loading="lazy"></p><ul><li>示例：<code>~-9 = 8</code></li></ul><p><img src="'+z+'" alt="" loading="lazy"></p><h3 id="_2-6-7-二进制左移" tabindex="-1">2.6.7 二进制左移 <a class="header-anchor" href="#_2-6-7-二进制左移" aria-label="Permalink to &quot;2.6.7 二进制左移&quot;"></a></h3><ul><li><p>在一定范围内，数据每向左移动一位，相当于原数据 × 2。（正数、负数都适用）</p></li><li><p>示例：<code>3 &lt;&lt; 4 = 48</code> （3 × 2^4）</p></li></ul><p><img src="'+H+'" alt="" loading="lazy"></p><ul><li>示例：<code>-3 &lt;&lt; 4 = -48</code> （-3 × 2 ^4）</li></ul><p><img src="'+M+'" alt="" loading="lazy"></p><h3 id="_2-6-8-二进制右移" tabindex="-1">2.6.8 二进制右移 <a class="header-anchor" href="#_2-6-8-二进制右移" aria-label="Permalink to &quot;2.6.8 二进制右移&quot;"></a></h3><ul><li>在一定范围内，数据每向右移动一位，相当于原数据 ÷ 2。（正数、负数都适用）</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 如果不能整除，则向下取整。</li><li>② 右移运算符最好只用于无符号整数，不要用于负数。因为不同系统对于右移后如何处理负数的符号位，有不同的做法，可能会得到不一样的结果。</li></ul></div><ul><li>示例：<code>69 &gt;&gt; 4 = 4</code> （69 ÷ 2^4 ）</li></ul><p><img src="'+P+'" alt="" loading="lazy"></p><ul><li>示例：<code>-69 &gt;&gt; 4 = -5</code> （-69 ÷ 2^4 ）</li></ul><p><img src="'+I+`" alt="" loading="lazy"></p><h2 id="_2-7-三元运算符" tabindex="-1">2.7 三元运算符 <a class="header-anchor" href="#_2-7-三元运算符" aria-label="Permalink to &quot;2.7 三元运算符&quot;"></a></h2><ul><li>语法：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">条件表达式 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">?</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> 表达式1 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> 表达式2 ;</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>如果条件表达式为非 0 （真），则整个表达式的值是表达式 1 。</li><li>如果条件表达式为 0 （假），则整个表达式的值是表达式 2 。</li></ul></div><ul><li>示例：</li></ul><div class="language-c vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">#include</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &lt;stdio.h&gt;</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>
@ -816,4 +816,4 @@ import{_ as p,c as n,j as s,a as i,a6 as a,o as l}from"./chunks/framework.hMCIpN
 <span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">    printf</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;result = </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">%d\\n</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, result);</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // result = 110</span></span>
 <span class="line"></span>
 <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">    return</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
-<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 &quot;2.8 运算符优先级&quot;"></a></h2><ul><li>C 语言中运算符的优先级，如下所示：</li></ul><table tabindex="0"><thead><tr><th><strong>优先级</strong></th><th><strong>运算符</strong></th><th><strong>名称或含义</strong></th><th><strong>结合方向</strong></th></tr></thead><tbody><tr><td><strong>1</strong></td><td><code>[]</code></td><td>数组下标</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>()</code></td><td>圆括号</td><td></td></tr><tr><td></td><td><code>.</code></td><td>成员选择（对象）</td><td></td></tr><tr><td></td><td><code>-&gt;</code></td><td>成员选择（指针）</td><td></td></tr><tr><td><strong>2</strong></td><td><code>-</code></td><td>负号运算符</td><td>⬅️（从右到左）</td></tr><tr><td></td><td><code>（类型）</code></td><td>强制类型转换</td><td></td></tr><tr><td></td><td><code>++</code></td><td>自增运算符</td><td></td></tr><tr><td></td><td><code>--</code></td><td>自减运算符</td><td></td></tr><tr><td></td><td><code>*</code></td><td>取值运算符</td><td></td></tr><tr><td></td><td><code>&amp;</code></td><td>取地址运算符</td><td></td></tr><tr><td></td><td><code>!</code></td><td>逻辑非运算符</td><td></td></tr><tr><td></td><td><code>~</code></td><td>按位取反运算符</td><td></td></tr><tr><td></td><td><code>sizeof</code></td><td>长度运算符</td><td></td></tr><tr><td><strong>3</strong></td><td><code>/</code></td><td>除</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>*</code></td><td>乘</td><td></td></tr><tr><td></td><td><code>%</code></td><td>余数（取模）</td><td></td></tr><tr><td><strong>4</strong></td><td><code>+</code></td><td>加</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>-</code></td><td>减</td><td></td></tr><tr><td><strong>5</strong></td><td><code>&lt;&lt;</code></td><td>左移</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>&gt;&gt;</code></td><td>右移</td><td></td></tr><tr><td><strong>6</strong></td><td><code>&gt;</code></td><td>大于</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>&gt;=</code></td><td>大于等于</td><td></td></tr><tr><td></td><td><code>&lt;</code></td><td>小于</td><td></td></tr><tr><td></td><td><code>&lt;=</code></td><td>小于等于</td><td></td></tr><tr><td><strong>7</strong></td><td><code>==</code></td><td>等于</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>!=</code></td><td>不等于</td><td></td></tr><tr><td><strong>8</strong></td><td><code>&amp;</code></td><td>按位与</td><td>➡️（从左到右）</td></tr><tr><td><strong>9</strong></td><td><code>^</code></td><td>按位异或</td><td>➡️（从左到右）</td></tr><tr><td><strong>10</strong></td><td><code>|</code></td><td>按位或</td><td>➡️（从左到右）</td></tr><tr><td><strong>11</strong></td><td><code>&amp;&amp;</code></td><td>逻辑与</td><td>➡️（从左到右）</td></tr><tr><td><strong>12</strong></td><td><code>||</code></td><td>逻辑或</td><td>➡️（从左到右）</td></tr><tr><td><strong>13</strong></td><td><code>?:</code></td><td>条件运算符</td><td>⬅️（从右到左）</td></tr><tr><td><strong>14</strong></td><td><code>=</code></td><td>赋值运算符</td><td>⬅️（从右到左）</td></tr><tr><td></td><td><code>/=</code></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>&lt;&lt;=</code></td><td>左移后赋值</td><td></td></tr><tr><td></td><td><code>&gt;&gt;=</code></td><td>右移后赋值</td><td></td></tr><tr><td></td><td><code>&amp;=</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>➡️（从左到右）</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 &gt; 算术运算符 &gt; 关系运算符 &gt; 逻辑运算符 &gt; 三元运算符 &gt; 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 &quot;第三章：附录&quot;"></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 &quot;3.1 字符集和字符集编码&quot;"></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 &quot;3.3.1 概述&quot;"></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>&#39;A&#39;</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="`+N+'" alt="" loading="lazy"></p><ul><li>Linux 中安装帮助手册：</li></ul><p><img src="'+V+'" alt="" loading="lazy"></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 &quot;3.3.2 ASCII 编码&quot;"></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="'+S+'" alt="" loading="lazy"></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="'+O+'" alt="" loading="lazy"></p><ul><li>其对应的 ASCII 编码表，如下所示：</li></ul><p><img src="'+U+'" alt="" loading="lazy"></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="'+Z+'" alt="" loading="lazy"></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="'+R+'" alt="" loading="lazy"></p><p><img src="'+j+'" alt="" loading="lazy"></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 &quot;3.3.3 Unicode 编码&quot;"></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="'+G+'" alt="" loading="lazy"></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="'+J+'" alt="" loading="lazy"></p><h2 id="_3-2-小数在内存中是如何存储的" tabindex="-1">3.2 小数在内存中是如何存储的？ <a class="header-anchor" href="#_3-2-小数在内存中是如何存储的" aria-label="Permalink to &quot;3.2 小数在内存中是如何存储的？&quot;"></a></h2>',281);function ks(ds,rs,cs,Es,gs,os){return l(),n("div",null,[W,s("p",null,[s("mjx-container",K,[(l(),n("svg",Y,ss)),is])]),s("ul",null,[s("li",null,[s("p",null,[i("那么，结果就是："),s("mjx-container",as,[(l(),n("svg",ns,ps)),ts])])]),hs]),es])}const us=p(X,[["render",ks]]);export{ys as __pageData,us 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></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 &quot;2.8 运算符优先级&quot;"></a></h2><ul><li>C 语言中运算符的优先级，如下所示：</li></ul><table tabindex="0"><thead><tr><th><strong>优先级</strong></th><th><strong>运算符</strong></th><th><strong>名称或含义</strong></th><th><strong>结合方向</strong></th></tr></thead><tbody><tr><td><strong>1</strong></td><td><code>[]</code></td><td>数组下标</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>()</code></td><td>圆括号</td><td></td></tr><tr><td></td><td><code>.</code></td><td>成员选择（对象）</td><td></td></tr><tr><td></td><td><code>-&gt;</code></td><td>成员选择（指针）</td><td></td></tr><tr><td><strong>2</strong></td><td><code>-</code></td><td>负号运算符</td><td>⬅️（从右到左）</td></tr><tr><td></td><td><code>（类型）</code></td><td>强制类型转换</td><td></td></tr><tr><td></td><td><code>++</code></td><td>自增运算符</td><td></td></tr><tr><td></td><td><code>--</code></td><td>自减运算符</td><td></td></tr><tr><td></td><td><code>*</code></td><td>取值运算符</td><td></td></tr><tr><td></td><td><code>&amp;</code></td><td>取地址运算符</td><td></td></tr><tr><td></td><td><code>!</code></td><td>逻辑非运算符</td><td></td></tr><tr><td></td><td><code>~</code></td><td>按位取反运算符</td><td></td></tr><tr><td></td><td><code>sizeof</code></td><td>长度运算符</td><td></td></tr><tr><td><strong>3</strong></td><td><code>/</code></td><td>除</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>*</code></td><td>乘</td><td></td></tr><tr><td></td><td><code>%</code></td><td>余数（取模）</td><td></td></tr><tr><td><strong>4</strong></td><td><code>+</code></td><td>加</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>-</code></td><td>减</td><td></td></tr><tr><td><strong>5</strong></td><td><code>&lt;&lt;</code></td><td>左移</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>&gt;&gt;</code></td><td>右移</td><td></td></tr><tr><td><strong>6</strong></td><td><code>&gt;</code></td><td>大于</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>&gt;=</code></td><td>大于等于</td><td></td></tr><tr><td></td><td><code>&lt;</code></td><td>小于</td><td></td></tr><tr><td></td><td><code>&lt;=</code></td><td>小于等于</td><td></td></tr><tr><td><strong>7</strong></td><td><code>==</code></td><td>等于</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>!=</code></td><td>不等于</td><td></td></tr><tr><td><strong>8</strong></td><td><code>&amp;</code></td><td>按位与</td><td>➡️（从左到右）</td></tr><tr><td><strong>9</strong></td><td><code>^</code></td><td>按位异或</td><td>➡️（从左到右）</td></tr><tr><td><strong>10</strong></td><td><code>|</code></td><td>按位或</td><td>➡️（从左到右）</td></tr><tr><td><strong>11</strong></td><td><code>&amp;&amp;</code></td><td>逻辑与</td><td>➡️（从左到右）</td></tr><tr><td><strong>12</strong></td><td><code>||</code></td><td>逻辑或</td><td>➡️（从左到右）</td></tr><tr><td><strong>13</strong></td><td><code>?:</code></td><td>条件运算符</td><td>⬅️（从右到左）</td></tr><tr><td><strong>14</strong></td><td><code>=</code></td><td>赋值运算符</td><td>⬅️（从右到左）</td></tr><tr><td></td><td><code>/=</code></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>&lt;&lt;=</code></td><td>左移后赋值</td><td></td></tr><tr><td></td><td><code>&gt;&gt;=</code></td><td>右移后赋值</td><td></td></tr><tr><td></td><td><code>&amp;=</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>➡️（从左到右）</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 &gt; 算术运算符 &gt; 关系运算符 &gt; 逻辑运算符 &gt; 三元运算符 &gt; 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 &quot;第三章：附录&quot;"></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 &quot;3.1 字符集和字符集编码&quot;"></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 &quot;3.3.1 概述&quot;"></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>&#39;A&#39;</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="`+N+'" alt="" loading="lazy"></p><ul><li>Linux 中安装帮助手册：</li></ul><p><img src="'+V+'" alt="" loading="lazy"></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 &quot;3.3.2 ASCII 编码&quot;"></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="'+S+'" alt="" loading="lazy"></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="'+O+'" alt="" loading="lazy"></p><ul><li>其对应的 ASCII 编码表，如下所示：</li></ul><p><img src="'+U+'" alt="" loading="lazy"></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="'+Z+'" alt="" loading="lazy"></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="'+R+'" alt="" loading="lazy"></p><p><img src="'+j+'" alt="" loading="lazy"></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 &quot;3.3.3 Unicode 编码&quot;"></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="'+G+'" alt="" loading="lazy"></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="'+J+'" alt="" loading="lazy"></p>',280);function ks(ds,rs,cs,Es,gs,os){return l(),n("div",null,[W,s("p",null,[s("mjx-container",K,[(l(),n("svg",Y,ss)),is])]),s("ul",null,[s("li",null,[s("p",null,[i("那么，结果就是："),s("mjx-container",as,[(l(),n("svg",ns,ps)),ts])])]),hs]),es])}const us=p(X,[["render",ks]]);export{ys as __pageData,us as default};
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 <span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">    --depth</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> \</span></span>
 <span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">    --single-branch</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> --branch=linux-msft-wsl-${</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">KERNEL_VERSION</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">}</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> \</span></span>
 <span class="line"><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">    https://github.com/microsoft/WSL2-Linux-Kernel.git</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><p><img src="/c/assets/162.B1eB55rC.gif" alt="" loading="lazy"></p><ul><li>编译内核代码：</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:#005CC5;--shiki-dark:#79B8FF;">cd</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> WSL2-Linux-Kernel</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><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;">make</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> -j</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> $(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">nproc</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">KCONFIG_CONFIG=Microsoft/config-wsl</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.VIcU-hkN.gif" alt="" loading="lazy"></p><ul><li>编译 perf 工具：</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:#005CC5;--shiki-dark:#79B8FF;">cd</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> tools/perf</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><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;">make</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> clean</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &amp;&amp; </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">make</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.BM9viRZJ.gif" alt="" loading="lazy"></p><ul><li>复制到 PATH 变量所指向的路径中：</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;">cp</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> perf</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> /usr/bin/</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/165.DpMBA1SK.gif" alt="" loading="lazy"></p><h3 id="_8-4-3-整合" tabindex="-1">8.4.3 整合 <a class="header-anchor" href="#_8-4-3-整合" aria-label="Permalink to &quot;8.4.3 整合&quot;"></a></h3><ul><li>CLion 中配置 perf 的路径：</li></ul><p><img src="/c/assets/166.DgXuU6LF.png" alt="" loading="lazy"></p><ul><li>在 CLion 中通过 perf 运行代码：</li></ul><p><img src="/c/assets/167.Dnw73s2h.gif" alt="" loading="lazy"></p><h2 id="_8-5-win-中文乱码问题" tabindex="-1">8.5 Win 中文乱码问题 <a class="header-anchor" href="#_8-5-win-中文乱码问题" aria-label="Permalink to &quot;8.5 Win 中文乱码问题&quot;"></a></h2><ul><li>前文，我们提及到，在 Win 中，如果出现<code>中文乱码</code>问题，就需要去<code>语言和区别</code>设置<code>系统区域</code>的编码为 UTF-8 ；但是，这样可能会造成其它的软件出现中文乱码问题，如：Xshell 等。</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① 之所以，修改系统的编码为 UTF-8 会出现问题，是因为早期的 Win 系统的中文默认编码是 GBK（目前也是，Win 并没有强制第三方软件使用 UTF-8 编码） ，而 Xshell 等也使用的这些编码，一旦我们修改为 UTF-8 之后，可能会造成这些第三方软件出现中文乱码问题（第三方软件适配问题，相信将来应该都会切换为 UTF-8 编码），体验较差！！！</li><li>② 在 Linux 或 MacOS 之所以不会出现中文乱码的问题，是因为这些系统默认的编码就是 UTF-8 。</li></ul></div><ul><li>其实，还有一种解决方案，如下所示：</li></ul><p><img src="/c/assets/168.SnFXRSaL.png" alt="" loading="lazy"></p><p><img src="/c/assets/169.DnoEqOjV.png" alt="" loading="lazy"></p><p><img src="/c/assets/170.BJBdn7pw.png" alt="" loading="lazy"></p><ul><li>测试一下，是否配置成功：</li></ul><p><img src="/c/assets/171.DXtQWYsM.gif" alt="" loading="lazy"></p><h2 id="_8-6-clion-中自动导入头文件" tabindex="-1">8.6 CLion 中自动导入头文件 <a class="header-anchor" href="#_8-6-clion-中自动导入头文件" aria-label="Permalink to &quot;8.6 CLion 中自动导入头文件&quot;"></a></h2><ul><li>在 CLion 中，最为强大的功能就是直接输入函数，然后让 IDE 帮我们自动导入头文件，包括自定义的头文件，相当实用。</li></ul><div class="note custom-block github-alert"><p class="custom-block-title">NOTE</p><p></p><ul><li>① CLion 中的<code>自动导入头文件</code>的<code>快捷键</code>是 <code>Alt + Enter</code> 。</li><li>② CLion 中的<code>自动提取变量的类型</code>的<code>快捷键</code>是 <code>Ctrl + Alt + V</code> 。</li></ul></div><p><img src="/c/assets/172.hcERTQkN.gif" alt="" loading="lazy"></p><ul><li>开启自动导入头文件的步骤，如下所示：</li></ul><p><img src="/c/assets/173.CioraEUv.png" alt="" loading="lazy"></p><p><img src="/c/assets/174.kWHWwnc_.png" alt="" loading="lazy"></p></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-e257564d><!--[--><!--]--><div class="edit-info" data-v-e257564d><!----><div class="last-updated" data-v-e257564d><p class="VPLastUpdated" data-v-e257564d data-v-e98dd255>上次更新: <time datetime="2024-08-26T02:53:22.000Z" data-v-e98dd255></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-e257564d><span class="visually-hidden" id="doc-footer-aria-label" data-v-e257564d>Pager</span><div class="pager" data-v-e257564d><a class="VPLink link pager-link prev" href="/c/notes/01_c-basic/00_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>上一篇</span><span class="title" data-v-e257564d>编程基础</span><!--]--></a></div><div class="pager" data-v-e257564d><a class="VPLink link pager-link next" href="/c/notes/01_c-basic/02_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>下一篇</span><span class="title" data-v-e257564d>变量和进制</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>
 <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></div></div><ul><li>其实，C 语言的底层逻辑很简单，C 语言压根不关心你定义的是有符号数还是无符号数，它只关心内存（如果定义的是有符号数，那就按照有符号数的规则来存储；如果定义的是无符号数，那就按照无符号数的规则来存储）。换言之，有符号数可以按照无符号数的规则来输出，无符号数也可以按照有符号数的规则来输出，至于输出结果对不对，那是程序员的事情，和 C 语言没有任何关系。</li></ul><div class="important custom-block github-alert"><p class="custom-block-title">IMPORTANT</p><p></p><ul><li>① 实际开发中，<code>printf</code> 函数中的常量、变量或表达式，需要和格式占位符一一对应；否则，将会出现数据错误的现象。</li><li>② 正因为上述的原因，很多现代化的编程语言，如：Java 等，直接取消了无符号的概念。但是，很多数据库是使用 C 语言开发的，如：MySQL 等，就提供了创建数据表的字段为无符号类型的功能，即：<code>UNSIGNED</code>（正整数） ，不要感觉困惑！！！</li><li>③ 对于 <code>1000 0000 …… 0000 0000</code> 这个特殊的补码，无法按照上述的方法转换为原码，所以计算机直接规定这个补码对应的值就是 <code>-2³¹</code>，至于为什么，下节我们会详细分析。</li></ul></div></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-e257564d><!--[--><!--]--><div class="edit-info" data-v-e257564d><!----><div class="last-updated" data-v-e257564d><p class="VPLastUpdated" data-v-e257564d data-v-e98dd255>上次更新: <time datetime="2024-08-26T02:53:22.000Z" data-v-e98dd255></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-e257564d><span class="visually-hidden" id="doc-footer-aria-label" data-v-e257564d>Pager</span><div class="pager" data-v-e257564d><a class="VPLink link pager-link prev" href="/c/notes/01_c-basic/01_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>上一篇</span><span class="title" data-v-e257564d>C 语言入门</span><!--]--></a></div><div class="pager" data-v-e257564d><a class="VPLink link pager-link next" href="/c/notes/01_c-basic/03_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>下一篇</span><span class="title" data-v-e257564d>数据类型和运算符</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:#6F42C1;--shiki-dark:#B392F0;">    printf</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;result = </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">%d\n</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, result);</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // result = 110</span></span>
 <span class="line"></span>
 <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">    return</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
-<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 &quot;2.8 运算符优先级&quot;"></a></h2><ul><li>C 语言中运算符的优先级，如下所示：</li></ul><table tabindex="0"><thead><tr><th><strong>优先级</strong></th><th><strong>运算符</strong></th><th><strong>名称或含义</strong></th><th><strong>结合方向</strong></th></tr></thead><tbody><tr><td><strong>1</strong></td><td><code>[]</code></td><td>数组下标</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>()</code></td><td>圆括号</td><td></td></tr><tr><td></td><td><code>.</code></td><td>成员选择（对象）</td><td></td></tr><tr><td></td><td><code>-&gt;</code></td><td>成员选择（指针）</td><td></td></tr><tr><td><strong>2</strong></td><td><code>-</code></td><td>负号运算符</td><td>⬅️（从右到左）</td></tr><tr><td></td><td><code>（类型）</code></td><td>强制类型转换</td><td></td></tr><tr><td></td><td><code>++</code></td><td>自增运算符</td><td></td></tr><tr><td></td><td><code>--</code></td><td>自减运算符</td><td></td></tr><tr><td></td><td><code>*</code></td><td>取值运算符</td><td></td></tr><tr><td></td><td><code>&amp;</code></td><td>取地址运算符</td><td></td></tr><tr><td></td><td><code>!</code></td><td>逻辑非运算符</td><td></td></tr><tr><td></td><td><code>~</code></td><td>按位取反运算符</td><td></td></tr><tr><td></td><td><code>sizeof</code></td><td>长度运算符</td><td></td></tr><tr><td><strong>3</strong></td><td><code>/</code></td><td>除</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>*</code></td><td>乘</td><td></td></tr><tr><td></td><td><code>%</code></td><td>余数（取模）</td><td></td></tr><tr><td><strong>4</strong></td><td><code>+</code></td><td>加</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>-</code></td><td>减</td><td></td></tr><tr><td><strong>5</strong></td><td><code>&lt;&lt;</code></td><td>左移</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>&gt;&gt;</code></td><td>右移</td><td></td></tr><tr><td><strong>6</strong></td><td><code>&gt;</code></td><td>大于</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>&gt;=</code></td><td>大于等于</td><td></td></tr><tr><td></td><td><code>&lt;</code></td><td>小于</td><td></td></tr><tr><td></td><td><code>&lt;=</code></td><td>小于等于</td><td></td></tr><tr><td><strong>7</strong></td><td><code>==</code></td><td>等于</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>!=</code></td><td>不等于</td><td></td></tr><tr><td><strong>8</strong></td><td><code>&amp;</code></td><td>按位与</td><td>➡️（从左到右）</td></tr><tr><td><strong>9</strong></td><td><code>^</code></td><td>按位异或</td><td>➡️（从左到右）</td></tr><tr><td><strong>10</strong></td><td><code>|</code></td><td>按位或</td><td>➡️（从左到右）</td></tr><tr><td><strong>11</strong></td><td><code>&amp;&amp;</code></td><td>逻辑与</td><td>➡️（从左到右）</td></tr><tr><td><strong>12</strong></td><td><code>||</code></td><td>逻辑或</td><td>➡️（从左到右）</td></tr><tr><td><strong>13</strong></td><td><code>?:</code></td><td>条件运算符</td><td>⬅️（从右到左）</td></tr><tr><td><strong>14</strong></td><td><code>=</code></td><td>赋值运算符</td><td>⬅️（从右到左）</td></tr><tr><td></td><td><code>/=</code></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>&lt;&lt;=</code></td><td>左移后赋值</td><td></td></tr><tr><td></td><td><code>&gt;&gt;=</code></td><td>右移后赋值</td><td></td></tr><tr><td></td><td><code>&amp;=</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>➡️（从左到右）</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 &gt; 算术运算符 &gt; 关系运算符 &gt; 逻辑运算符 &gt; 三元运算符 &gt; 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 &quot;第三章：附录&quot;"></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 &quot;3.1 字符集和字符集编码&quot;"></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 &quot;3.3.1 概述&quot;"></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>&#39;A&#39;</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/35.CGTVELeO.png" alt="" loading="lazy"></p><ul><li>Linux 中安装帮助手册：</li></ul><p><img src="/c/assets/36.Bz4_lEH0.gif" alt="" loading="lazy"></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 &quot;3.3.2 ASCII 编码&quot;"></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/37.CcDWE4nn.png" alt="" loading="lazy"></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/38.B7y2_JVX.gif" alt="" loading="lazy"></p><ul><li>其对应的 ASCII 编码表，如下所示：</li></ul><p><img src="/c/assets/39.Btcc3rs2.gif" alt="" loading="lazy"></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/40.CR4ARW8y.png" alt="" loading="lazy"></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/39.Btcc3rs2.gif" alt="" loading="lazy"></p><p><img src="/c/assets/42.DOX3ymYP.gif" alt="" loading="lazy"></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 &quot;3.3.3 Unicode 编码&quot;"></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/43.Cie9_tkP.gif" alt="" loading="lazy"></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/44.DLjH9Ges.png" alt="" loading="lazy"></p><h2 id="_3-2-小数在内存中是如何存储的" tabindex="-1">3.2 小数在内存中是如何存储的？ <a class="header-anchor" href="#_3-2-小数在内存中是如何存储的" aria-label="Permalink to 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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 &quot;2.8 运算符优先级&quot;"></a></h2><ul><li>C 语言中运算符的优先级，如下所示：</li></ul><table tabindex="0"><thead><tr><th><strong>优先级</strong></th><th><strong>运算符</strong></th><th><strong>名称或含义</strong></th><th><strong>结合方向</strong></th></tr></thead><tbody><tr><td><strong>1</strong></td><td><code>[]</code></td><td>数组下标</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>()</code></td><td>圆括号</td><td></td></tr><tr><td></td><td><code>.</code></td><td>成员选择（对象）</td><td></td></tr><tr><td></td><td><code>-&gt;</code></td><td>成员选择（指针）</td><td></td></tr><tr><td><strong>2</strong></td><td><code>-</code></td><td>负号运算符</td><td>⬅️（从右到左）</td></tr><tr><td></td><td><code>（类型）</code></td><td>强制类型转换</td><td></td></tr><tr><td></td><td><code>++</code></td><td>自增运算符</td><td></td></tr><tr><td></td><td><code>--</code></td><td>自减运算符</td><td></td></tr><tr><td></td><td><code>*</code></td><td>取值运算符</td><td></td></tr><tr><td></td><td><code>&amp;</code></td><td>取地址运算符</td><td></td></tr><tr><td></td><td><code>!</code></td><td>逻辑非运算符</td><td></td></tr><tr><td></td><td><code>~</code></td><td>按位取反运算符</td><td></td></tr><tr><td></td><td><code>sizeof</code></td><td>长度运算符</td><td></td></tr><tr><td><strong>3</strong></td><td><code>/</code></td><td>除</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>*</code></td><td>乘</td><td></td></tr><tr><td></td><td><code>%</code></td><td>余数（取模）</td><td></td></tr><tr><td><strong>4</strong></td><td><code>+</code></td><td>加</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>-</code></td><td>减</td><td></td></tr><tr><td><strong>5</strong></td><td><code>&lt;&lt;</code></td><td>左移</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>&gt;&gt;</code></td><td>右移</td><td></td></tr><tr><td><strong>6</strong></td><td><code>&gt;</code></td><td>大于</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>&gt;=</code></td><td>大于等于</td><td></td></tr><tr><td></td><td><code>&lt;</code></td><td>小于</td><td></td></tr><tr><td></td><td><code>&lt;=</code></td><td>小于等于</td><td></td></tr><tr><td><strong>7</strong></td><td><code>==</code></td><td>等于</td><td>➡️（从左到右）</td></tr><tr><td></td><td><code>!=</code></td><td>不等于</td><td></td></tr><tr><td><strong>8</strong></td><td><code>&amp;</code></td><td>按位与</td><td>➡️（从左到右）</td></tr><tr><td><strong>9</strong></td><td><code>^</code></td><td>按位异或</td><td>➡️（从左到右）</td></tr><tr><td><strong>10</strong></td><td><code>|</code></td><td>按位或</td><td>➡️（从左到右）</td></tr><tr><td><strong>11</strong></td><td><code>&amp;&amp;</code></td><td>逻辑与</td><td>➡️（从左到右）</td></tr><tr><td><strong>12</strong></td><td><code>||</code></td><td>逻辑或</td><td>➡️（从左到右）</td></tr><tr><td><strong>13</strong></td><td><code>?:</code></td><td>条件运算符</td><td>⬅️（从右到左）</td></tr><tr><td><strong>14</strong></td><td><code>=</code></td><td>赋值运算符</td><td>⬅️（从右到左）</td></tr><tr><td></td><td><code>/=</code></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>&lt;&lt;=</code></td><td>左移后赋值</td><td></td></tr><tr><td></td><td><code>&gt;&gt;=</code></td><td>右移后赋值</td><td></td></tr><tr><td></td><td><code>&amp;=</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>➡️（从左到右）</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 &gt; 算术运算符 &gt; 关系运算符 &gt; 逻辑运算符 &gt; 三元运算符 &gt; 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 &quot;第三章：附录&quot;"></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 &quot;3.1 字符集和字符集编码&quot;"></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 &quot;3.3.1 概述&quot;"></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>&#39;A&#39;</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/35.CGTVELeO.png" alt="" loading="lazy"></p><ul><li>Linux 中安装帮助手册：</li></ul><p><img src="/c/assets/36.Bz4_lEH0.gif" alt="" loading="lazy"></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 &quot;3.3.2 ASCII 编码&quot;"></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/37.CcDWE4nn.png" alt="" loading="lazy"></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/38.B7y2_JVX.gif" alt="" loading="lazy"></p><ul><li>其对应的 ASCII 编码表，如下所示：</li></ul><p><img src="/c/assets/39.Btcc3rs2.gif" alt="" loading="lazy"></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/40.CR4ARW8y.png" alt="" loading="lazy"></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/39.Btcc3rs2.gif" alt="" loading="lazy"></p><p><img src="/c/assets/42.DOX3ymYP.gif" alt="" loading="lazy"></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 &quot;3.3.3 Unicode 编码&quot;"></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/43.Cie9_tkP.gif" alt="" loading="lazy"></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/44.DLjH9Ges.png" alt="" loading="lazy"></p></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-e257564d><!--[--><!--]--><div class="edit-info" 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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></div></div><div class="warning custom-block github-alert"><p class="custom-block-title">WARNING</p><p></p><p>在上述示例中，<code>arr</code> 和 <code>&amp;arr</code> 的值是一样的，但是对应的含义是不同的。</p><ul><li>① <code>arr</code> 是数组名，在大多数情况下会转换为数组第一个元素的地址，即：<code>arr</code> 等价于 <code>&amp;arr[0]</code>，其数据类型是 <code>int *</code>。</li><li>② <code>&amp;arr</code>是数组名的地址，即整个数组的地址，它指向数组本身，并不是数组第一个元素的地址，<code>&amp;arr</code> 的数据类型是 <code>int(*)[3]</code>。</li></ul></div></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-e257564d><!--[--><!--]--><div class="edit-info" data-v-e257564d><!----><div class="last-updated" data-v-e257564d><p class="VPLastUpdated" data-v-e257564d data-v-e98dd255>上次更新: <time datetime="2024-08-12T02:47:17.000Z" data-v-e98dd255></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-e257564d><span class="visually-hidden" id="doc-footer-aria-label" data-v-e257564d>Pager</span><div class="pager" data-v-e257564d><a class="VPLink link pager-link prev" href="/c/notes/01_c-basic/04_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>上一篇</span><span class="title" data-v-e257564d>流程控制</span><!--]--></a></div><div class="pager" data-v-e257564d><a class="VPLink link pager-link next" href="/c/notes/01_c-basic/06_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>下一篇</span><span class="title" data-v-e257564d>指针</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>
 <span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">printf</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;Address of array: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">%p\n</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&amp;</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">arr</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">  // 返回整个数组的地址</span></span>
 <span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">printf</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;Address of pointer: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">%p\n</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&amp;</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">ptr</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">  // 返回指针变量ptr的地址</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></li></ol><p>综上所述，通过这些示例和解释，可以看出数组名虽然在某些场合下可以像指针一样使用，但它并不是一个真正的指针变量，而是一个常量，表示数组的首地址。</p></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-e257564d><!--[--><!--]--><div class="edit-info" data-v-e257564d><!----><div class="last-updated" data-v-e257564d><p class="VPLastUpdated" data-v-e257564d data-v-e98dd255>上次更新: <time datetime="2024-08-13T02:39:52.000Z" data-v-e98dd255></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-e257564d><span class="visually-hidden" id="doc-footer-aria-label" data-v-e257564d>Pager</span><div class="pager" data-v-e257564d><a class="VPLink link pager-link prev" href="/c/notes/01_c-basic/05_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>上一篇</span><span class="title" data-v-e257564d>数组</span><!--]--></a></div><div class="pager" data-v-e257564d><a class="VPLink link pager-link next" href="/c/notes/01_c-basic/07_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>下一篇</span><span class="title" data-v-e257564d>函数</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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class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><section class="VPSidebarItem level-1 collapsible collapsed" data-v-b7550ba0 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h3 class="text" data-v-b7550ba0>meson</h3><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-2 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/03_build/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>meson 入门</p><!--]--></a><!----></div><!----></div><!--]--></div></section><section class="VPSidebarItem level-1 collapsible collapsed" data-v-b7550ba0 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h3 class="text" data-v-b7550ba0>Cmake</h3><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-2 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/03_build/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>Cmake 入门</p><!--]--></a><!----></div><!----></div><!--]--></div></section><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/03_build/01_${commonDirectoryName}/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>Conan </p><!--]--></a><!----></div><!----></div><section class="VPSidebarItem level-1 collapsible collapsed" data-v-b7550ba0 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h3 class="text" data-v-b7550ba0>Gradle</h3><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-2 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/03_build/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>Gradle 入门</p><!--]--></a><!----></div><!----></div><!--]--></div></section><!--]--></div></section></div><div class="no-transition group" data-v-c40bc020><section class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h2 class="text" data-v-b7550ba0>Linux</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/04_linux/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>Linux 初识和安装</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-c40bc020><section class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h2 class="text" data-v-b7550ba0>C++ 基础</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>C++ 入门</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/02_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>变量、数据类型、运算符</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/03_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>流程控制</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/04_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>数组</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/05_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>指针</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/06_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>函数</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/07_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>自定义数据类型</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/08_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>类和对象</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/09_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>C++ 引用</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/10_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>继承和派生</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/11_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>C++ 多态和虚函数</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/12_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>运算符重载</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/13_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>模板</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/14_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>C++ 异常</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/15_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>面向对象进阶</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/16_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>文件操作和 IO 流</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/17_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>STL（标准模板库）</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-c40bc020><div class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><p class="text" data-v-b7550ba0>C++ 高级</p><!----></div><!----></div></div><div class="no-transition group" data-v-c40bc020><div class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><p class="text" data-v-b7550ba0>QT 桌面开发</p><!----></div><!----></div></div><div class="no-transition group" data-v-c40bc020><div class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><p class="text" data-v-b7550ba0>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" data-v-3f215769></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-39a288b8><div class="content-container" data-v-39a288b8><!--[--><!--]--><main class="main" data-v-39a288b8><div style="position:relative;" class="vp-doc _c_notes_about_" data-v-39a288b8><div><h3 id="后端技术栈" tabindex="-1">后端技术栈 <a class="header-anchor" href="#后端技术栈" aria-label="Permalink to &quot;后端技术栈&quot;"></a></h3><p><img src="https://img.shields.io/badge/-Spring-6DB33F?logo=Spring&amp;logoColor=FFF" alt="Spring" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Spring%20Boot-6DB33F?logo=Spring-Boot&amp;logoColor=FFF" alt="Spring Boot" style="display:inline-block;">  <img src="https://img.shields.io/badge/-MySQL-4479A1?logo=MySQL&amp;logoColor=FFF" alt="MySQL" style="display:inline-block;">  <img src="https://img.shields.io/badge/-MariaDB-A9A9A9?logo=MariaDB&amp;logoColor=003545" alt="MariaDB" style="display:inline-block;">  <img src="https://img.shields.io/badge/-PostgreSQL-C0C0C0?logo=PostgreSQL&amp;logoColor=4169E1" alt="PostgreSQL" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Oracle-C0C0C0?logo=Oracle&amp;logoColor=F80000" alt="Oracle" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Microsoft%20SQL%20Server-D3D3D3?logo=Microsoft-SQL-Server&amp;logoColor=CC2927" alt="Microsoft SQL Server" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Redis-DC382D?logo=Redis&amp;logoColor=FFF" alt="Redis" style="display:inline-block;">  <img src="https://img.shields.io/badge/-MongoDB-47A248?logo=MongoDB&amp;logoColor=FFF" alt="MongoDB" style="display:inline-block;">  <img src="https://img.shields.io/badge/-RabbitMQ-FF6600?logo=RabbitMQ&amp;logoColor=FFF" alt="RabbitMQ" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Solr-D9411E?logo=Apache-Solr&amp;logoColor=FFF" alt="Solr" style="display:inline-block;">  <img src="https://img.shields.io/badge/-ElasticSearch-005571?logo=ElasticSearch&amp;logoColor=FFF" alt="ElasticSearch" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Logstash-A9A9A9?logo=Logstash&amp;logoColor=005571" alt="Logstash" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Kibana-A9A9A9?logo=Kibana&amp;logoColor=005571" alt="Kibana" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Kafka-C0C0C0?logo=Apache-Kafka&amp;logoColor=231F20" alt="Kafka" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Consul-F24C53?logo=Consul&amp;logoColor=FFF" alt="Consul" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Tomcat-F8DC75?logo=Apache-Tomcat&amp;logoColor=000" alt="Tomcat" style="display:inline-block;">  <img src="https://img.shields.io/badge/-JUnit5-25A162?logo=JUnit5&amp;logoColor=FFF" alt="JUnit5" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Liquibase-2962FF?logo=Liquibase&amp;logoColor=FFF" alt="Liquibase" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Maven-C71A36?logo=Apache-Maven&amp;logoColor=FFF" alt="Maven" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Gradle-D3D3D3?logo=Gradle&amp;logoColor=02303A" alt="Gradle" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Spring%20Security-6DB33F?logo=Spring-Security&amp;logoColor=FFF" alt="Spring Security" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Hibernate-59666C?logo=Hibernate&amp;logoColor=FFF" alt="Hibernate" style="display:inline-block;">  <img src="https://img.shields.io/badge/-JSON-000?logo=JSON&amp;logoColor=FFF" alt="JSON" style="display:inline-block;">  <img src="https://img.shields.io/badge/-JWT-000?logo=JSON-Web-Tokens&amp;logoColor=FFF" alt="JWT" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Java-F78C40?logo=OpenJDK&amp;logoColor=FFF" alt="Java" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Python-A9A9A9?logo=Python&amp;logoColor=3776AB" alt="Python" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Android-C0C0C0?logo=Android&amp;logoColor=3DDC84" alt="Android" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Go-DCDCDC?logo=Go&amp;logoColor=00ADD8" alt="Go" style="display:inline-block;">  <img src="https://img.shields.io/badge/-GraphQL-FFF?logo=GraphQL&amp;logoColor=E10098" alt="GraphQL" style="display:inline-block;">  </p><h3 id="前端技术栈" tabindex="-1">前端技术栈 <a class="header-anchor" href="#前端技术栈" aria-label="Permalink to &quot;前端技术栈&quot;"></a></h3><p><img src="https://img.shields.io/badge/-Vue3-C0C0C0?logo=Vue.js&amp;logoColor=4FC08D" alt="Vue3" style="display:inline-block;">  <img src="https://img.shields.io/badge/-TypeScript-C0C0C0?logo=TypeScript&amp;logoColor=3178C6" alt="TypeScript" style="display:inline-block;">  <img src="https://img.shields.io/badge/-Ant%20Design-C0C0C0?logo=Ant-Design&amp;logoColor=0170FE" alt="Ant Design" style="display:inline-block;">  <img 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class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><section class="VPSidebarItem level-1 collapsible collapsed" data-v-b7550ba0 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h3 class="text" data-v-b7550ba0>meson</h3><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-2 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/03_build/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>meson 入门</p><!--]--></a><!----></div><!----></div><!--]--></div></section><section class="VPSidebarItem level-1 collapsible collapsed" data-v-b7550ba0 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h3 class="text" data-v-b7550ba0>Cmake</h3><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-2 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/03_build/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>Cmake 入门</p><!--]--></a><!----></div><!----></div><!--]--></div></section><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/03_build/01_${commonDirectoryName}/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>Conan </p><!--]--></a><!----></div><!----></div><section class="VPSidebarItem level-1 collapsible collapsed" data-v-b7550ba0 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h3 class="text" data-v-b7550ba0>Gradle</h3><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-2 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/03_build/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>Gradle 入门</p><!--]--></a><!----></div><!----></div><!--]--></div></section><!--]--></div></section></div><div class="no-transition group" data-v-c40bc020><section class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h2 class="text" data-v-b7550ba0>Linux</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/04_linux/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>Linux 初识和安装</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-c40bc020><section class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><h2 class="text" data-v-b7550ba0>C++ 基础</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-b7550ba0><span class="vpi-chevron-right caret-icon" data-v-b7550ba0></span></div></div><div class="items" data-v-b7550ba0><!--[--><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/01_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>C++ 入门</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/02_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>变量、数据类型、运算符</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/03_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>流程控制</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/04_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>数组</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/05_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>指针</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/06_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>函数</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/07_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>自定义数据类型</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/08_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>类和对象</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/09_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>C++ 引用</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/10_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>继承和派生</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/11_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>C++ 多态和虚函数</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/12_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>运算符重载</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/13_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>模板</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/14_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>C++ 异常</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/15_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>面向对象进阶</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/16_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>文件操作和 IO 流</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-b7550ba0 data-v-b7550ba0><div class="item" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><a class="VPLink link link" href="/c/notes/05_cpp/17_xdx/" data-v-b7550ba0><!--[--><p class="text" data-v-b7550ba0>STL（标准模板库）</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="no-transition group" data-v-c40bc020><div class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><p class="text" data-v-b7550ba0>C++ 高级</p><!----></div><!----></div></div><div class="no-transition group" data-v-c40bc020><div class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><p class="text" data-v-b7550ba0>QT 桌面开发</p><!----></div><!----></div></div><div class="no-transition group" data-v-c40bc020><div class="VPSidebarItem level-0 collapsible collapsed" data-v-c40bc020 data-v-b7550ba0><div class="item" role="button" tabindex="0" data-v-b7550ba0><div class="indicator" data-v-b7550ba0></div><p class="text" data-v-b7550ba0>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" data-v-3f215769></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-39a288b8><div class="content-container" data-v-39a288b8><!--[--><!--]--><main class="main" data-v-39a288b8><div style="position:relative;" class="vp-doc _c_notes_" data-v-39a288b8><div><h1 id="c-c-学科" tabindex="-1">c/c++ 学科 <a class="header-anchor" href="#c-c-学科" aria-label="Permalink to &quot;c/c++ 学科&quot;"></a></h1><hr><iframe src="https://roadmap.sh/r/embed?id=6695c8262b17b182cbf4b520" width="115%" height="500px" frameBorder="0"></iframe></div></div></main><footer class="VPDocFooter" data-v-39a288b8 data-v-e257564d><!--[--><!--]--><div class="edit-info" data-v-e257564d><!----><div class="last-updated" data-v-e257564d><p class="VPLastUpdated" data-v-e257564d data-v-e98dd255>上次更新: <time datetime="2024-08-01T02:00:11.000Z" data-v-e98dd255></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-e257564d><span class="visually-hidden" id="doc-footer-aria-label" data-v-e257564d>Pager</span><div class="pager" data-v-e257564d><!----></div><div class="pager" data-v-e257564d><a class="VPLink link pager-link next" href="/c/notes/01_c-basic/00_xdx/" data-v-e257564d><!--[--><span class="desc" data-v-e257564d>下一篇</span><span class="title" 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