klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
c33c28794d7656d0e1daa2bf81e55af2cfd532f9
hustoj/web/cppreference-zh/chmhelp/cpp-string-byte-strchr.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

148 lines
8.1 KiB
HTML
Raw Blame History

<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>std::strchr</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_byte_strchr skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>strchr</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-string.html">string</a>&lrm; | <a href="cpp-string-byte.html">byte</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody>
<tr class="t-dsc-header">
<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-cstring.html">&lt;cstring&gt;</a></code></div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> strchr<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> str, <span class="kw4">int</span> ch <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad">
<div><span class="mw-geshi cpp source-cpp">&nbsp; &nbsp; &nbsp; <span class="kw4">char</span><span class="sy2">*</span> strchr<span class="br0">(</span> &nbsp; &nbsp; &nbsp; <span class="kw4">char</span><span class="sy2">*</span> str, <span class="kw4">int</span> ch <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#22312; <code>str</code> &#25152;&#25351;&#21521;&#30340;&#23383;&#33410;&#23383;&#31526;&#20018;&#20013;&#23547;&#25214;&#23383;&#31526; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">static_cast</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="br0">(</span>ch<span class="br0">)</span></span></span> &#30340;&#39318;&#27425;&#20986;&#29616;&#12290;</p>
<p>&#35748;&#20026;&#32456;&#27490;&#31354;&#23383;&#31526;&#26159;&#23383;&#31526;&#20018;&#30340;&#19968;&#37096;&#20998;&#65292;&#32780;&#19988;&#33509;&#25628;&#32034; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&#39;<span class="es5">\0</span>&#39;</span></span></span> &#21017;&#33021;&#25214;&#21040;&#23427;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>str</td>
<td>-</td>
<td>&#25351;&#21521;&#24453;&#20998;&#26512;&#30340;&#31354;&#32456;&#27490;&#23383;&#33410;&#23383;&#31526;&#20018;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>ch</td>
<td>-</td>
<td>&#35201;&#25628;&#32034;&#30340;&#23383;&#31526;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#25351;&#21521; <code>str</code> &#25214;&#21040;&#30340;&#23383;&#31526;&#30340;&#25351;&#38024;&#65292;&#33509;&#26410;&#25214;&#21040;&#35813;&#23383;&#31526;&#21017;&#20026;&#31354;&#25351;&#38024;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;cstring&gt;</span>
<span class="kw4">int</span> main<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>str <span class="sy1">=</span> <span class="st0">&quot;Try not. Do, or do not. There is no try.&quot;</span><span class="sy4">;</span>
<span class="kw4">char</span> target <span class="sy1">=</span> <span class="st0">&#39;T&#39;</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>result <span class="sy1">=</span> str<span class="sy4">;</span>
<span class="kw1">while</span> <span class="br0">(</span><span class="br0">(</span>result <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">strchr</span><span class="br0">(</span>result, target<span class="br0">)</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> <a href="cpp-types-NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Found &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> target
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39; starting at &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> result <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="co1">// &#33258;&#22686; result&#65292;&#21542;&#21017;&#25105;&#20204;&#23558;&#25214;&#21040;&#30456;&#21516;&#20301;&#32622;&#30340;&#30446;&#26631;</span>
<span class="sy2">++</span>result<span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">Found &#39;T&#39; starting at &#39;Try not. Do, or do not. There is no try.&#39;
Found &#39;T&#39; starting at &#39;There is no try.&#39;</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-byte-memchr.html"><span class="t-lines"><span>memchr</span></span></a></div>
</div>
</td>
<td>&#22312;&#25968;&#32452;&#20013;&#25628;&#32034;&#23383;&#31526;&#30340;&#39318;&#27425;&#20986;&#29616;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-basic_string-find.html"><span class="t-lines"><span>find</span></span></a></div>
</div>
</td>
<td>&#20110;&#23383;&#31526;&#20018;&#20013;&#23547;&#25214;&#23383;&#31526;<br />
<span class="t-mark">(<code>std::basic_string&lt;CharT,Traits,Allocator&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-wide-wcschr.html"><span class="t-lines"><span>wcschr</span></span></a></div>
</div>
</td>
<td>&#23547;&#25214;&#23485;&#23383;&#31526;&#20018;&#20013;&#23485;&#23383;&#31526;&#30340;&#39318;&#27425;&#20986;&#29616;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-byte-strrchr.html"><span class="t-lines"><span>strrchr</span></span></a></div>
</div>
</td>
<td>&#23547;&#25214;&#23383;&#31526;&#30340;&#26368;&#21518;&#20986;&#29616;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-byte-strpbrk.html"><span class="t-lines"><span>strpbrk</span></span></a></div>
</div>
</td>
<td>&#23547;&#25214;&#20219;&#20309;&#26469;&#33258;&#20998;&#38548;&#31526;&#38598;&#21512;&#30340;&#23383;&#31526;&#30340;&#39318;&#20010;&#20301;&#32622;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink