NAME
iswdigit - test for decimal digit wide character
SYNOPSIS
#include <wctype.h>
I int iswdigit(wint_t wc );
DESCRIPTION
The
R 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
R 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 behavior of
R iswdigit ()
depends on the
LC_CTYPE
category of the
current locale.
SEE ALSO
ČLÁNKY DO MAILU