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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) func-
       tion.  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
       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 information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



GNU                               1999-07-25                       ISWDIGIT(3)

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