iswxdigit
From cppreference.com
C
Concurrency support (C11)
Null-terminated wide strings
Character manipulation
Conversions to numeric formats
String manipulation
Array manipulation
Types
Macros
(C95)
(C95)
(C95)
(C95)
(C95)
iswxdigit
(C95)
(C99)
(C95)(C99)
(C99)(C95)(C99)
(C95)(C11)
(C95)(C11)
(C95)
(C95)(C95)
(C95)(C95)
(C95)
Defined in header
<wctype.h>
int iswxdigit( wint_t ch );
(since C95)
Checks if the given wide character corresponds (if narrowed) to a hexadecimal numeric character, i.e. one of 0123456789abcdefABCDEF
.
[edit] Parameters
ch
-
wide character
[edit] Return value
Non-zero value if the wide character is a hexadecimal numeric character, zero otherwise.
[edit] Notes
iswdigit and iswxdigit
are the only standard wide character classification functions that are not affected by the currently installed C locale.
[edit] Example
Some locales offer additional character classes that detect non-ASCII digits
Run this code
#include <locale.h> #include <stdio.h> #include <wchar.h> #include <wctype.h> void test(wchar_t a3, wchar_t u3, wchar_t j3) { printf ("\t '%lc' '%lc' '%lc'\n", a3, u3, j3); printf ("iswxdigit: %d %d %d\n", !!iswxdigit(a3), !!iswxdigit(u3), !!iswxdigit(j3)); printf ("jdigit: %d %d %d\n", !!iswctype (a3, wctype ("jdigit")), !!iswctype (u3, wctype ("jdigit")), !!iswctype (j3, wctype ("jdigit"))); } int main(void) { wchar_t a3 = L'9'; // the ASCII digit 9 wchar_t u3 = L'〩'; // the CJK numeral 9 wchar_t j3 = L'9'; // the full-width digit 9 setlocale (LC_ALL, "en_US.utf8"); puts ("In American locale:"); test(a3, u3, j3); setlocale (LC_ALL, "ja_JP.utf8"); puts ("\nIn Japanese locale:"); test(a3, u3, j3); }
Possible output:
In American locale: '9' '〩' '9' iswxdigit: 1 0 0 jdigit: 0 0 0 In Japanese locale: '9' '〩' '9' iswxdigit: 1 0 0 jdigit: 0 0 1
[edit] References
- C23 standard (ISO/IEC 9899:2024):
- 7.30.2.1.12 The iswxdigit function (p: TBD)
- C17 standard (ISO/IEC 9899:2018):
- 7.30.2.1.12 The iswxdigit function (p: TBD)
- C11 standard (ISO/IEC 9899:2011):
- 7.30.2.1.12 The iswxdigit function (p: 451)
- C99 standard (ISO/IEC 9899:1999):
- 7.25.2.1.12 The iswxdigit function (p: 397)
[edit] See also
C++ documentation for iswxdigit
ASCII values | characters |
isxdigit | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
decimal | hexadecimal | octal | |||||||||||||
0–8 | \x0 –\x8
|
0円 –10円
|
control codes (NUL , etc.)
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
9 | \x9
|
11円
|
tab (\t )
|
≠0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
10–13 | \xA –\xD
|
12円 –15円
|
whitespaces (\n , \v , \f , \r )
|
≠0
|
0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
14–31 | \xE –\x1F
|
16円 –37円
|
control codes | ≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
32 | \x20
|
40円
|
space | 0
|
≠0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
33–47 | \x21 –\x2F
|
41円 –57円
|
!"#$%&'()*+,-./
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
48–57 | \x30 –\x39
|
60円 –71円
|
0123456789
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
0
|
0
|
0
|
≠0
|
≠0
|
58–64 | \x3A –\x40
|
72円 –100円
|
:;<=>?@
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
65–70 | \x41 –\x46
|
101円 –106円
|
ABCDEF
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
≠0
|
≠0
|
0
|
0
|
≠0
|
71–90 | \x47 –\x5A
|
107円 –132円
|
GHIJKLMNOP QRSTUVWXYZ
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
≠0
|
≠0
|
0
|
0
|
0
|
91–96 | \x5B –\x60
|
133円 –140円
|
[\]^_`
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
97–102 | \x61 –\x66
|
141円 –146円
|
abcdef
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
≠0
|
0
|
≠0
|
0
|
≠0
|
103–122 | \x67 –\x7A
|
147円 –172円
|
ghijklmnop qrstuvwxyz
|
0
|
≠0
|
0
|
0
|
≠0
|
0
|
≠0
|
≠0
|
0
|
≠0
|
0
|
0
|
123–126 | \x7B –\x7E
|
173円 –176円
|
{|}~
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
127 | \x7F
|
177円
|
backspace character (DEL )
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|