192 lines
8.6 KiB
HTML
192 lines
8.6 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>fputc, putc</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_io_fputc skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">fputc, putc</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="c.html">c</a>‎ | <a href="c-io.html">io</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<div>定义于头文件 <code><stdio.h></code></div>
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<td></td>
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<div><span class="mw-geshi c source-c"><span class="kw4">int</span> fputc<span class="br0">(</span> <span class="kw4">int</span> ch, <a href="c-io.html"><span class="kw882">FILE</span></a> <span class="sy2">*</span>stream <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi c source-c"><span class="kw4">int</span> putc<span class="br0">(</span> <span class="kw4">int</span> ch, <a href="c-io.html"><span class="kw882">FILE</span></a> <span class="sy2">*</span>stream <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td class="t-dcl-nopad"></td>
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</tbody>
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<tbody>
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<tr class="t-dcl-sep">
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<td></td>
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<p>写入字符 <code>ch</code> 到给定输出流 <code>stream</code> 。 <span class="t-c"><span class="mw-geshi c source-c">putc<span class="br0">(</span><span class="br0">)</span></span></span> 可以实现为宏并对 <code>stream</code> 求值超过一次,故对应的参数决不应是有副效应的表达式。</p>
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<p>在内部,在写入前将字符转换为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">char</span></span></span> 。</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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<tr class="t-par">
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<td>ch</td>
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<td>-</td>
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<td>要被写入的字符</td>
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</tr>
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<tr class="t-par">
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<td>stream</td>
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<td>-</td>
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<td>输出流</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0_2">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>ch</td>
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<td>-</td>
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<td>要写入的字符</td>
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</tr>
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<tr class="t-par">
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<td>stream</td>
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<td>-</td>
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<td>输出流</td>
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</tr>
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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>成功时,返回被写入字符。</p>
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<p>失败时,返回 <span class="t-lc"><a href="c-io.html">EOF</a></span> 并设置 <span class="t-lc">stream</span> 上的<i>错误</i>指示器(见 <span class="t-lc"><a href="c-io-ferror.html">ferror()</a></span> )。</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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<p>putc带错误检查</p>
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="c source-c">
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<pre class="de1"><span class="co2">#include <stdio.h></span>
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<span class="co2">#include <stdlib.h></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">int</span> ret_code <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">char</span> c <span class="sy1">=</span> <span class="st0">'a'</span><span class="sy4">;</span> <span class="br0">(</span>ret_code <span class="sy3">!</span><span class="sy1">=</span> <a href="c-io.html"><span class="kw887">EOF</span></a><span class="br0">)</span> <span class="sy3">&&</span> <span class="br0">(</span>c <span class="sy3">!</span><span class="sy1">=</span> <span class="st0">'z'</span><span class="br0">)</span><span class="sy4">;</span> c<span class="sy2">++</span><span class="br0">)</span>
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ret_code <span class="sy1">=</span> putc<span class="br0">(</span>c, <a href="c-io.html"><span class="kw885">stdout</span></a><span class="br0">)</span><span class="sy4">;</span>
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<span class="coMULTI">/* 测试是否抵达 EOF 。 */</span>
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<span class="kw1">if</span> <span class="br0">(</span>ret_code <span class="sy1">==</span> <a href="c-io.html"><span class="kw887">EOF</span></a><span class="br0">)</span>
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<span class="kw1">if</span> <span class="br0">(</span><a href="c-io-ferror.html"><span class="kw876">ferror</span></a><span class="br0">(</span><a href="c-io.html"><span class="kw885">stdout</span></a><span class="br0">)</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="c-io-perror.html"><span class="kw877">perror</span></a><span class="br0">(</span><span class="st0">"putc()"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-io-fprintf.html"><span class="kw850">fprintf</span></a><span class="br0">(</span><a href="c-io.html"><span class="kw886">stderr</span></a>,<span class="st0">"putc() failed in file %s at line # %d<span class="es1">\n</span>"</span>, __FILE__,__LINE__<span class="sy2">-</span><span class="nu0">7</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="c-program-exit.html"><span class="kw488">exit</span></a><span class="br0">(</span><a href="c-program-EXIT_status.html"><span class="kw494">EXIT_FAILURE</span></a><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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putc<span class="br0">(</span><span class="st0">'<span class="es1">\n</span>'</span>, <a href="c-io.html"><span class="kw885">stdout</span></a><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">return</span> <a href="c-program-EXIT_status.html"><span class="kw493">EXIT_SUCCESS</span></a><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</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">abcdefghijklmnopqrstuvwxy</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
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<div class="t-ref-std-11">
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<ul>
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<li>C11 标准(ISO/IEC 9899:2011):</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.21.7.3 The fputc function (p: 331)</li>
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</ul>
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</dd>
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</dl>
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<dl>
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<dd>
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<ul>
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<li>7.21.7.7 The putc function (p: 333)</li>
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</ul>
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</dd>
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</dl>
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<div class="t-ref-std-c99">
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<ul>
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<li>C99 标准(ISO/IEC 9899:1999):</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.19.7.3 The fputc function (p: 297)</li>
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</ul>
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</dd>
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</dl>
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<dl>
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<dd>
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<ul>
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<li>7.19.7.8 The putc function (p: 299)</li>
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</ul>
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</dd>
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</dl>
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<div class="t-ref-std-c89">
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<ul>
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<li>C89/C90 标准(ISO/IEC 9899:1990):</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>4.9.7.3 The fputc function</li>
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</ul>
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</dd>
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</dl>
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<dl>
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<dd>
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<ul>
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<li>4.9.7.8 The putc function</li>
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</ul>
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</dd>
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</dl>
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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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-io-putchar.html"><span class="t-lines"><span>putchar</span></span></a></div>
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</div>
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</td>
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<td>将一个字符写入 <code>stdout</code><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>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</body>
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