131 lines
7.6 KiB
HTML
131 lines
7.6 KiB
HTML
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<title>std::strcmp</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_byte_strcmp skin-cppreference2 action-view cpp-navbar">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>strcmp</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-string.html">string</a>‎ | <a href="cpp-string-byte.html">byte</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-cstring.html"><cstring></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> strcmp<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>lhs, <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>以字典序比较二个空终止字节字符串。</p>
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<p>结果的符号是被比较的字符串中首对不同字符（都转译成 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">char</span></span></span> ）的值间的差值符号。</p>
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<p>若 <code>lhs</code> 或 <code>rhs</code> 不是指向空终止字节字符串的指针，则行为未定义。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<td>lhs, rhs</td>
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<td>-</td>
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<td>指向待比较的空终止字节字符串的指针</td>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>若字典序中 <code>lhs</code> 先出现于 <code>rhs</code> 则为负值。</p>
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<p>若 <code>lhs</code> 与 <code>rhs</code> 比较相等则为零。</p>
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<p>若字典序中 <code>lhs</code> 后出现于 <code>rhs</code> 则为正值。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <vector></span>
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<span class="co2">#include <cstring></span>
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<span class="co2">#include <algorithm></span>
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<span class="co2">#include <iostream></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span><span class="sy1">></span> cats <span class="br0">{</span><span class="st0">"Heathcliff"</span>, <span class="st0">"Snagglepuss"</span>, <span class="st0">"Hobbes"</span>, <span class="st0">"Garfield"</span><span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-algorithm-sort.html"><span class="kw1617">std::<span class="me2">sort</span></span></a><span class="br0">(</span>cats.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, cats.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>strA, <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>strB<span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> std<span class="sy4">::</span><span class="me2">strcmp</span><span class="br0">(</span>strA, strB<span class="br0">)</span> <span class="sy1"><</span> <span class="nu0">0</span><span class="sy4">;</span>
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<span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>cat <span class="sy4">:</span> cats<span class="br0">)</span> <span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> cat <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">Garfield
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Heathcliff
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Hobbes
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Snagglepuss</pre></div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-byte-strncmp.html"><span class="t-lines"><span>strncmp</span></span></a></div>
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</div>
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</td>
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<td>比较两个字符串的一定量字符<br />
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<span class="t-mark">(函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-wide-wcscmp.html"><span class="t-lines"><span>wcscmp</span></span></a></div>
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</div>
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</td>
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<td>比较两个宽字符串<br />
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<span class="t-mark">(函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-byte-memcmp.html"><span class="t-lines"><span>memcmp</span></span></a></div>
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</div>
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</td>
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<td>比较两个缓冲区<br />
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<span class="t-mark">(函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-byte-strcoll.html"><span class="t-lines"><span>strcoll</span></span></a></div>
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</td>
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<td>按照当前本地环境比较两个字符串<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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