NAME

       iswdigit - test for decimal digit wide character

SYNOPSIS

       #include <wctype.h>

       int iswdigit (wint_t wc);

DESCRIPTION

       The  iswdigit function is the wide-character equivalent of the isdigit function. It tests whether wc is a
       wide character belonging to the wide character class "digit".

       The wide character class "digit" is a subclass of the wide character class "xdigit", and therefore also a
       subclass of the wide character class "alnum", of the  wide  character  class  "graph"  and  of  the  wide
       character class "print".

       Being  a  subclass of the wide character class "print", the wide character class "digit" is disjoint from
       the wide character class "cntrl".

       Being a subclass of the wide character class "graph", the wide character class "digit" is  disjoint  from
       the wide character class "space" and its subclass "blank".

       Being  a  subclass of the wide character class "alnum", the wide character class "digit" is disjoint from
       the wide character class "punct".

       The wide character class "digit" is disjoint from the wide character class  "alpha"  and  therefore  also
       disjoint from its subclasses "lower", "upper".

       The wide character class "digit" always contains exactly the digits '0' to '9'.

RETURN VALUE

       The  iswdigit  function  returns non-zero if wc is a wide character belonging to the wide character class
       "digit". Otherwise it returns zero.

CONFORMING TO

       ISO/ANSI C, UNIX98

SEE ALSO

       isdigit(3), iswctype(3)

NOTES

       The behaviour of iswdigit depends on the LC_CTYPE category of the current locale.

GNU                                               July 25, 1999                                      ISWDIGIT(3)