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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><ctype.h></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_002_074"> </a>NAME</h4><blockquote>ctype.h - character types</blockquote><h4><a name = "tag_000_002_075"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <ctype.h></code></pre></blockquote><h4><a name = "tag_000_002_076"> </a>DESCRIPTION</h4><blockquote>The<i><ctype.h></i>headerdeclares the following as functions and may also define them as macros.Function prototypes must be provided for use with an ISO Ccompiler.<pre><code>int <a href="isalnum.html">isalnum</a>(int);int <a href="isalpha.html">isalpha</a>(int);int <a href="isascii.html">isascii</a>(int);int <a href="iscntrl.html">iscntrl</a>(int);int <a href="isdigit.html">isdigit</a>(int);int <a href="isgraph.html">isgraph</a>(int);int <a href="islower.html">islower</a>(int);int <a href="isprint.html">isprint</a>(int);int <a href="ispunct.html">ispunct</a>(int);int <a href="isspace.html">isspace</a>(int);int <a href="isupper.html">isupper</a>(int);int <a href="isxdigit.html">isxdigit</a>(int);int <a href="toascii.html">toascii</a>(int);int <a href="tolower.html">tolower</a>(int);int <a href="toupper.html">toupper</a>(int);</code></pre><p>The following are defined as macros:<pre><code>int <a href="_toupper.html">_toupper</a>(int);int <a href="_tolower.html">_tolower</a>(int);</code></pre></blockquote><h4><a name = "tag_000_002_077"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_002_078"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_002_079"> </a>SEE ALSO</h4><blockquote><i><a href="isalnum.html">isalnum()</a></i>,<i><a href="isalpha.html">isalpha()</a></i>,<i><a href="isascii.html">isascii()</a></i>,<i><a href="iscntrl.html">iscntrl()</a></i>,<i><a href="isdigit.html">isdigit()</a></i>,<i><a href="isgraph.html">isgraph()</a></i>,<i><a href="islower.html">islower()</a></i>,<i><a href="isprint.html">isprint()</a></i>,<i><a href="ispunct.html">ispunct()</a></i>,<i><a href="isspace.html">isspace()</a></i>,<i><a href="isupper.html">isupper()</a></i>,<i><a href="isxdigit.html">isxdigit()</a></i>,<i><a href="mblen.html">mblen()</a></i>,<i><a href="mbstowcs.html">mbstowcs()</a></i>,<i><a href="mbtowc.html">mbtowc()</a></i>,<i><a href="setlocale.html">setlocale()</a></i>,<i><a href="toascii.html">toascii()</a></i>,<i><a href="tolower.html">tolower()</a></i>,<i><a href="_tolower.html">_tolower()</a></i>,<i><a href="toupper.html">toupper()</a></i>,<i><a href="_toupper.html">_toupper()</a></i>,<i><a href="wcstombs.html">wcstombs()</a></i>,<i><a href="wctomb.html">wctomb()</a></i>,<i><a href="locale.h.html"><locale.h></a></i>.</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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