Manpages - iswdigit.3

iswdigit - test for decimal digit wide character

  #include <wctype.h>

  int iswdigit(wint_t wc);

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’.

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

For an explanation of the terms used in this section, see *attributes*(7).

POSIX.1-2001, POSIX.1-2008, C99.

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

*isdigit*(3), *iswctype*(3)

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