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3.27 iswxdigit—hexadecimal digit wide character test

Synopsis 

     #include <wctype.h>
     int iswxdigit(wint_t c);

Description
iswxdigit is a function which classifies wide character values that are 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.