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ISWCTYPE(P)			    POSIX Programmer's Manual			      ISWCTYPE(P)

       iswctype - test character for a specified class

       #include <wctype.h>

       int iswctype(wint_t wc, wctype_t charclass);

       The iswctype() function shall determine whether the wide-character code wc has the charac-
       ter class charclass, returning true or false. The iswctype() function is defined  on  WEOF
       and  wide-character  codes  corresponding  to the valid character encodings in the current
       locale. If the wc argument is not in the domain of the function, the result is  undefined.
       If the value of charclass is invalid (that is, not obtained by a call to wctype() or char-
       class is invalidated by a subsequent  call  to  setlocale()  that  has  affected  category
       LC_CTYPE ) the result is unspecified.

       The  iswctype()	function  shall return non-zero (true) if and only if wc has the property
       described by charclass.	  If charclass is 0, iswctype() shall return 0.

       No errors are defined.

       The following sections are informative.

   Testing for a Valid Character
	      #include <wctype.h>
	      int yes_or_no;
	      wint_t wc;
	      wctype_t valid_class;
	      if ((valid_class=wctype("vowel")) == (wctype_t)0)
		  /* Invalid character class. */

       The twelve strings "alnum" , "alpha" , "blank" , "cntrl" , "digit" , "graph" ,  "lower"	,
       "print" , "punct" , "space" , "upper" , and "xdigit" are reserved for the standard charac-
       ter classes. In the table below, the functions in the left column are  equivalent  to  the
       functions in the right column.

	      iswalnum(wc)    iswctype(wc, wctype("alnum"))
	      iswalpha(wc)    iswctype(wc, wctype("alpha"))
	      iswblank(wc)    iswctype(wc, wctype("blank"))
	      iswcntrl(wc)    iswctype(wc, wctype("cntrl"))
	      iswdigit(wc)    iswctype(wc, wctype("digit"))
	      iswgraph(wc)    iswctype(wc, wctype("graph"))
	      iswlower(wc)    iswctype(wc, wctype("lower"))
	      iswprint(wc)    iswctype(wc, wctype("print"))
	      iswpunct(wc)    iswctype(wc, wctype("punct"))
	      iswspace(wc)    iswctype(wc, wctype("space"))
	      iswupper(wc)    iswctype(wc, wctype("upper"))
	      iswxdigit(wc)   iswctype(wc, wctype("xdigit"))



       iswalnum() , iswalpha() , iswcntrl() , iswdigit() , iswgraph() , iswlower() , iswprint() ,
       iswpunct() , iswspace() , iswupper() , iswxdigit() , setlocale() ,  wctype()  ,	the  Base
       Definitions volume of IEEE Std 1003.1-2001, <wchar.h>, <wctype.h>

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				      ISWCTYPE(P)
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