iswdigit(3) - Linux man page

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-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 aq0aq to aq9aq.

Return Value

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

Conforming to

C99.

Notes

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

Referenced By

isprint(3)