ISWDIGIT(3)

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 '0' to '9'.

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

CONFORMING TO
C99.

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

SEE ALSO
isdigit(3), iswctype(3)