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 function. It tests whether wc is a wide char
acter 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
ISO/ANSI C, UNIX98
SEE ALSO
isdigit(3), iswctype(3)
NOTES
The behaviour of iswdigit depends on the LC_CTYPE category
of the current locale.
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