NAME

       iswdigit - test for decimal digit wide character

LIBRARY

       Standard C library (libc, -lc)

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-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 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 │
       └────────────────────────────────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       POSIX.1-2001, C99.

NOTES

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

SEE ALSO

       isdigit(3), iswctype(3)