iswdigit - test for decimal digit wide character
#include <wctype.h>
int iswdigit (wint_t wc);
The iswdigit function is the wide-character equivalent of the isdigit
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 non-zero if wc is a wide character
belonging to the wide character class "digit". Otherwise it returns
zero.
ISO/ANSI C, UNIX98
isdigit(3), iswctype(3)
The behaviour of iswdigit depends on the LC_CTYPE category of the current
locale.
GNU 1999-07-25 ISWDIGIT(3)
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