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ISWDIGIT(3)                Linux Programmer's Manual               ISWDIGIT(3)



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(3) 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  sub-
       class  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
       C99.

NOTES
       The behavior of iswdigit() depends on the LC_CTYPE category of the current locale.

SEE ALSO
       isdigit(3), iswctype(3)

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               1999-07-25                       ISWDIGIT(3)