| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | NOTES | SEE ALSO | COLOPHON | The Linux Programming Interface |
ISWDIGIT(3) Linux Programmer's Manual ISWDIGIT(3)
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(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.
C99.
The behavior of iswdigit() depends on the LC_CTYPE category of the current
locale.
isdigit(3), iswctype(3)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 1999-07-25 ISWDIGIT(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface