iswdigit(3) — Linux manual page

iswdigit(3)             Library Functions Manual             iswdigit(3)

NAME         top

       iswdigit - test for decimal digit wide character

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <wctype.h>

       int iswdigit(wint_t wc);

DESCRIPTION         top

       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         top

       The iswdigit() function returns nonzero if wc is a wide character
       belonging to the wide-character class "digit".  Otherwise, it
       returns zero.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────────────┬───────────────┬────────────────┐
       │ Interface                    │ Attribute     │ Value          │
       ├──────────────────────────────┼───────────────┼────────────────┤
       │ iswdigit()                   │ Thread safety │ MT-Safe locale │
       └──────────────────────────────┴───────────────┴────────────────┘

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       POSIX.1-2001, C99.

NOTES         top

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

SEE ALSO         top

       isdigit(3), iswctype(3)

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                    iswdigit(3)

Pages that refer to this page: isalpha(3),  iswctype(3)

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