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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>memchr</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">Standard C String and Character</a> > <a href= "memchr.html">memchr</a> </div> <div class="name-format"> memchr </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <string.h> void *memchr( const void *buffer, int ch, size_t count );</pre> <p>The memchr() function looks for the first occurrence of <em>ch</em> within <em>count</em> characters in the array pointed to by <em>buffer</em>. The return value points to the location of the first occurrence of <em>ch</em>, or <strong>NULL</strong> if <em>ch</em> isn't found. For example:</p> <pre class="example-code"> char names[] = "Alan Bob Chris X Dave"; if( memchr(names,'X',strlen(names)) == <strong>NULL</strong> ) printf( "Didn't find an X\n" ); else printf( "Found an X\n" ); </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="memcmp.html">memcmp</a><br> <a href="memcpy.html">memcpy</a><br> <a href="strstr.html">strstr</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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