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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>memcmp</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_592"> </a>NAME</h4><blockquote>memcmp - compare bytes in memory</blockquote><h4><a name = "tag_000_007_593"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="string.h.html">string.h</a>>int memcmp(const void *<i>s1</i>, const void *<i>s2</i>, size_t <i>n</i>);</code></pre></blockquote><h4><a name = "tag_000_007_594"> </a>DESCRIPTION</h4><blockquote>The<i>memcmp()</i>function compares the first<i>n</i>bytes (each interpreted as <b>unsigned char</b>) of the object pointed to by<i>s1</i>to the first<i>n</i>bytes of the object pointed to by<i>s2</i>.<p>The sign of a non-zero return value is determined by the sign of thedifference between the values of the first pair of bytes (both interpretedas type<b>unsigned char</b>)that differ in the objects being compared.</blockquote><h4><a name = "tag_000_007_595"> </a>RETURN VALUE</h4><blockquote>The<i>memcmp()</i>function returns an integer greater than, equal to or less than0, if the object pointed to by<i>s1</i>is greater than, equal to or less than the object pointed to by<i>s2</i>respectively.</blockquote><h4><a name = "tag_000_007_596"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_007_597"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_598"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_599"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_600"> </a>SEE ALSO</h4><blockquote><i><a href="string.h.html"><string.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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