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 (explode) :

• Argument
• Return Values