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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>iswctype</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_161"> </a>NAME</h4><blockquote>iswctype - test character for a specified class</blockquote><h4><a name = "tag_000_007_162"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="wctype.h.html">wctype.h</a>>int iswctype(wint_t <i>wc</i>, wctype_t <i>charclass</i>);</code></pre></blockquote><h4><a name = "tag_000_007_163"> </a>DESCRIPTION</h4><blockquote>The<i>iswctype()</i>function determines whether the wide-character code<i>wc</i>has the character class<i>charclass</i>,returning true or false.The<i>iswctype()</i>function is defined on WEOF and wide-character codes corresponding to thevalid character encodings in the current locale.If the<i>wc</i>argument is not in the domain of the function, the result is undefined.If the value of<i>charclass</i>is invalid (that is, not obtained by a call to<i><a href="wctype.html">wctype()</a></i>or<i>charclass</i>is invalidated by asubsequent call to<i><a href="setlocale.html">setlocale()</a></i>that has affected category LC_CTYPE)the result is implementation-dependent.</blockquote><h4><a name = "tag_000_007_164"> </a>RETURN VALUE</h4><blockquote>The<i>iswctype()</i>function returns 0 for false and non-zero for true.</blockquote><h4><a name = "tag_000_007_165"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_007_166"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_167"> </a>APPLICATION USAGE</h4><blockquote>The twelve strings -"alnum","alpha","blank""cntrl","digit","graph","lower","print","punct","space","upper" and"xdigit" -are reserved for the standard character classes.In the table below,the functions in the left column are equivalent tothe functions in the right column.<p><table <tr valign=top><th align=left>iswalnum(<i>wc</i>)<th align=left>iswctype(<i>wc</i>, wctype("alnum"))<tr valign=top><td align=left>iswalpha(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("alpha"))<tr valign=top><td align=left>iswcntrl(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("cntrl"))<tr valign=top><td align=left>iswdigit(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("digit"))<tr valign=top><td align=left>iswgraph(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("graph"))<tr valign=top><td align=left>iswlower(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("lower"))<tr valign=top><td align=left>iswprint(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("print"))<tr valign=top><td align=left>iswpunct(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("punct"))<tr valign=top><td align=left>iswspace(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("space"))<tr valign=top><td align=left>iswupper(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("upper"))<tr valign=top><td align=left>iswxdigit(<i>wc</i>)<td align=left>iswctype(<i>wc</i>, wctype("xdigit"))</table><dl><dt><b>Note:</b><dd>The call:<pre><code>iswctype(<i>wc</i>, wctype("blank"))</code></pre>does not have an equivalent<i>isw*()</i>function.</dl></blockquote><h4><a name = "tag_000_007_168"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_169"> </a>SEE ALSO</h4><blockquote><i><a href="iswalnum.html">iswalnum()</a></i>,<i><a href="iswalpha.html">iswalpha()</a></i>,<i><a href="iswcntrl.html">iswcntrl()</a></i>,<i><a href="iswdigit.html">iswdigit()</a></i>,<i><a href="iswgraph.html">iswgraph()</a></i>,<i><a href="iswlower.html">iswlower()</a></i>,<i><a href="iswprint.html">iswprint()</a></i>,<i><a href="iswpunct.html">iswpunct()</a></i>,<i><a href="iswspace.html">iswspace()</a></i>,<i><a href="iswupper.html">iswupper()</a></i>,<i><a href="iswxdigit.html">iswxdigit()</a></i>,<i><a href="wctype.html">wctype()</a></i>,<i><a href="wctype.h.html"><wctype.h></a></i>,<i><a href="wchar.h.html"><wchar.h></a></i>.<br></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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