106 lines
6.5 KiB
HTML
106 lines
6.5 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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<title>std::puts</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_c_puts 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"><span style="font-size:0.7em; line-height:130%">std::</span>puts</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-io.html">io</a>‎ | <a href="cpp-io-c.html">c</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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<td>
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<div>定义于头文件 <code><a href="cpp-header-cstdio.html"><cstdio></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> puts<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>str <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td></td>
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<p>写入每个来自空终止字符串 <code>str</code> 的字符及附加换行符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'<span class="es1">\n</span>'</span></span></span> 到输出流 <code>stdout</code> ，如同以重复执行 <span class="t-lc"><a href="cpp-io-c-fputc.html">std::putc</a></span> 写入。</p>
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<p>不写入来自 <code>str</code> 的空终止字符。</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>str</td>
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<td>-</td>
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<td>要写入的字符串</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>成功时返回非负值</p>
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<p>失败时，返回 <span class="t-lc"><a href="cpp-io-c.html">EOF</a></span> 并设置 <code>stdout</code> 的<i>错误</i>指示器（见 <span class="t-lc"><a href="cpp-io-c-ferror.html">std::ferror()</a></span> ）。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p><code>std::puts</code> 函数后附一个换行字符到输出，而 <span class="t-lc"><a href="cpp-io-c-fputs.html">std::fputs</a></span> 不这么做。</p>
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<p>不同的实现返回不同的非负数：一些返回最后写入的字符，一些返回写入的字符数（或若字符串长于 INT_MAX 则返回它），一些简单地返回非负常量。</p>
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<p>在重定向 stdout 到文件时，导致 <code>std::puts</code> 失败的典型原因是用尽了文件系统的空间。</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 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="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <cstdio></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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<span class="kw4">int</span> rc <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">puts</span><span class="br0">(</span><span class="st0">"Hello World"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span>rc <span class="sy1">==</span> <a href="cpp-io-c.html"><span class="kw1881">EOF</span></a><span class="br0">)</span>
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<a href="cpp-io-c-perror.html"><span class="kw1872">std::<span class="me2">perror</span></span></a><span class="br0">(</span><span class="st0">"puts()"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// POSIX 要求设置 errno</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">Hello World</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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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-c-fputs.html"><span class="t-lines"><span>fputs</span></span></a></div>
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</div>
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</td>
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<td>写字符串到文件流<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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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="cpp-io-c-fprintf.html"><span class="t-lines"><span>printf</span><span>fprintf</span><span>sprintf</span><span>snprintf</span></span></a></div>
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<div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>打印有格式输出到 <span class="t-lc"><a href="cpp-io-c.html">stdout</a></span>、文件流或缓冲区<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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</html>
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