/*FUNCTION	<<iswxdigit>>---hexadecimal digit wide-character testINDEX	iswxdigitANSI_SYNOPSIS	#include <wctype.h>	int iswxdigit(wint_t <[c]>);TRAD_SYNOPSIS	#include <wctype.h>	int iswxdigit(<[c]>)	wint_t <[c]>;DESCRIPTION<<iswxdigit>> is a function which classifies wide-character values thatare hexadecimal digits.RETURNS<<iswxdigit>> returns non-zero if <[c]> is a hexadecimal digit wide-character.PORTABILITY<<iswxdigit>> is C99.No supporting OS subroutines are required.*/#include <_ansi.h>#include <wctype.h>int_DEFUN(iswxdigit,(c), wint_t c){  return ((c >= (wint_t)'0' && c <= (wint_t)'9') ||	  (c >= (wint_t)'a' && c <= (wint_t)'f') ||	  (c >= (wint_t)'A' && c <= (wint_t)'F'));}