iswxdigit

   Indicates if a wide character is a hexadecimal digit (0 to 9, A
   to F, or a to f) in the program's current locale.

   Format

     #include  <wctype.h> (ISO C)

     #include  <wchar.h> (XPG4)

     int iswxdigit  (wint_t wc);
 

Additional information available:

Argument        Return_Values