iswdigit(3)                Library Functions Manual                iswdigit(3)

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)

Linux man-pages 6.7               2023-10-31                       iswdigit(3)