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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>while</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">C/C++ Keywords</a> > <a href="while.html">while</a> </div> <div class="name-format"> while </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> while( condition ) { statement-list; }</pre> <p>The while keyword is used as a looping construct that will evaluate the <em>statement-list</em> as long as <em>condition</em> is true. Note that if the <em>condition</em> starts off as false, the <em>statement-list</em> will never be executed. (You can use a <a href="do.html">do</a> loop to guarantee that the statement-list will be executed at least once.) For example:</p> <pre class="example-code"> bool done = false; while( !done ) { ProcessData(); if( StopLooping() ) { done = true; } } </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="break.html">break</a><br> <a href="continue.html">continue</a><br> <a href="do.html">do</a><br> <a href="for.html">for</a><br> <a href="if.html">if</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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