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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  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  nonzero  if  wc is a wide character
       belonging to the wide-character class "digit".  Otherwise,  it  returns
       zero.
ATTRIBUTES
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).
       +-----------+---------------+----------------+
       |Interface  | Attribute     | Value          |
       +-----------+---------------+----------------+
       |iswdigit() | Thread safety | MT-Safe locale |
       +-----------+---------------+----------------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, C99.
NOTES
       The behavior of iswdigit() depends on the LC_CTYPE category of the cur-
       rent locale.
SEE ALSO
       isdigit(3), iswctype(3)
COLOPHON
       This  page  is  part of release 4.15 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.
GNU                               2015-08-08                       ISWDIGIT(3)