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3.20 iswdigit—decimal digit wide character test

Synopsis 

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

Description
iswdigit is a function which classifies wide-character values that are decimal digits.
Returns
iswdigit returns non-zero if c is a decimal digit wide character.
Portability
iswdigit is C99.

No supporting OS subroutines are required.