iswdigit

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
       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  charac-
       ter class "digit" is disjoint from the wide character class "cntrl".

       Being  a subclass of the wide character class "graph", the wide charac-
       ter 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 charac-
       ter 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 cur-
       rent locale.



GNU                               1999-07-25                       ISWDIGIT(3)