iswdigit - test for decimal digit wide character
Standard C library (
libc,
-lc)
#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).
Interface |
Attribute |
Value |
iswdigit () |
Thread safety |
MT-Safe locale |
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)