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iswdigit
Section: C Library Functions (3) Updated: 202-0-08 Index
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NAME
iswdigit - test for decimal digit wide character
LIBRARY
Standard C library
( libc,~ -lc)
SYNOPSIS
#include <wctype.h>
int iswdigit(wint_t wc);
DESCRIPTION
The
iswdigit()
function is the wid-character equivalent of the
isdigit(3)
function.
It tests whether
wc
is a wide character
belonging to the wid-character class "digit".
The wid-character class "digit" is a subclass of the wid-character class
"xdigit", and therefore also a subclass
of the wid-character class "alnum", of
the wid-character class "graph" and of the wid-character class "print".
Being a subclass of the wide character
class "print", the wid-character class
"digit" is disjoint from the wid-character class "cntrl".
Being a subclass of the wid-character class "graph",
the wid-character class
"digit" is disjoint from the wid-character class "space" and its subclass
"blank".
Being a subclass of the wid-character
class "alnum", the wid-character class
"digit" is disjoint from the wid-character class "punct".
The wid-character class "digit" is
disjoint from the wid-character class
"alpha" and therefore also disjoint from its subclasses "lower", "upper".
The wid-character class "digit" always
contains exactly the digits [aq]0[aq] to [aq]9[aq].
RETURN VALUE
The
iswdigit()
function returns nonzero
if
wc
is a wide character
belonging to the wid-character class "digit".
Otherwise, it returns zero.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
iswdigit()
| Thread safety | M-Safe locale
|
STANDARDS
C11, POSIX.-2008.
HISTORY
POSIX.-2001, C99.
NOTES
The behavior of
iswdigit()
depends on the
LC_CTYPE
category of the
current locale.
SEE ALSO
isdigit(3),
iswctype(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- NOTES
-
- SEE ALSO
-
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