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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>strcat</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_009_021"> </a>NAME</h4><blockquote>strcat - concatenate two strings</blockquote><h4><a name = "tag_000_009_022"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="string.h.html">string.h</a>>char *strcat(char *<i>s1</i>, const char *<i>s2</i>);</code></pre></blockquote><h4><a name = "tag_000_009_023"> </a>DESCRIPTION</h4><blockquote>The<i>strcat()</i>function appends a copy of the string pointed to by<i>s2</i>(including the terminating null byte) to the end of thestring pointed to by<i>s1</i>.The initial byte of<i>s2</i>overwrites the null byte at the end of<i>s1</i>.If copying takes place between objects that overlap, thebehaviour is undefined.</blockquote><h4><a name = "tag_000_009_024"> </a>RETURN VALUE</h4><blockquote>The<i>strcat()</i>function returns<i>s1</i>;no return value is reserved to indicate an error.</blockquote><h4><a name = "tag_000_009_025"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_009_026"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_027"> </a>APPLICATION USAGE</h4><blockquote>This issue is aligned with the ISO C standard; this does not affect compatibilitywith XPG3 applications.Reliable error detection by this function was never guaranteed.</blockquote><h4><a name = "tag_000_009_028"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_029"> </a>SEE ALSO</h4><blockquote><i><a href="strncat.html">strncat()</a></i>,<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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