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C

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Technical Specifications

Symbol index

 

Strings library

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Null-terminated multibyte strings

Null-terminated wide strings

 

Null-terminated wide strings

Functions Character classification iswalnum (C95) iswalpha (C95) iswlower (C95) iswupper (C95) iswdigit (C95) iswxdigit (C95)   iswblank (C99) iswctype (C95) iswcntrl (C95) iswgraph (C95) iswspace (C95) iswprint (C95) iswpunct (C95) wctype (C95) Character manipulation towlower (C95) towupper (C95) wctrans (C95) towctrans (C95) Conversions to numeric formats wcstolwcstoll (C95)(C99) wcstofwcstodwcstold (C99)(C95)(C99) wcstoulwcstoull (C95)(C99) wcstoimaxwcstoumax (C99)(C99)     String manipulation wcscpywcscpy_s (C95)(C11) wcsncpywcsncpy_s (C95)(C11) wcsxfrm (C95) wcscatwcscat_s (C95)(C11) wcsncatwcsncat_s (C95)(C11)

String examination wcslenwcsnlen_s (C95)(C11) wcsstr (C95) wcscmp (C95) wcsncmp (C95) wcscoll (C95) wcschr (C95) wcsrchr (C95) wcspbrk (C95) wcsspn (C95) wcscspn (C95) wcstokwcstok_s (C95)(C11) Array manipulation wmemcpywmemcpy_s (C95)(C11) wmemmovewmemmove_s (C95)(C11)   wmemcmp (C95) wmemchr (C95) wmemset (C95) Types wchar_t wint_t (C95) wctrans_t wctype_t (C95)(C95) Macros WCHAR_MIN WCHAR_MAX (C95)(C95) WEOF (C95)

 

Defined in header <wctype.h>
int iswxdigit( wint_t ch );		(since C95)

百度 李某收受礼金未达到涉法的3万元底线，也无法证实二人之间有具体的许诺、实施谋利行为，第二种意见认定其“受贿”要件不足。

Checks if the given wide character corresponds (if narrowed) to a hexadecimal numeric character, i.e. one of 0123456789abcdefABCDEF.

Parameters

ch

-

wide character

Return value

Non-zero value if the wide character is a hexadecimal numeric character, zero otherwise.

Notes

iswdigit and iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale.

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

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)

See also

isxdigit	checks if a character is a hexadecimal character (function)
C++ documentation for iswxdigit

ASCII values			characters	iscntrl iswcntrl	isprint iswprint	isspace iswspace	isblank iswblank	isgraph iswgraph	ispunct iswpunct	isalnum iswalnum	isalpha iswalpha	isupper iswupper	islower iswlower	isdigit iswdigit	isxdigit iswxdigit
decimal	hexadecimal	octal
0–8	\x0–\x8	\0–\10	control codes (NUL, etc.)	≠0	0	0	0	0	0	0	0	0	0	0	0
9	\x9	\11	tab (\t)	≠0	0	≠0	≠0	0	0	0	0	0	0	0	0
10–13	\xA–\xD	\12–\15	whitespaces (\n, \v, \f, \r)	≠0	0	≠0	0	0	0	0	0	0	0	0	0
14–31	\xE–\x1F	\16–\37	control codes	≠0	0	0	0	0	0	0	0	0	0	0	0
32	\x20	\40	space	0	≠0	≠0	≠0	0	0	0	0	0	0	0	0
33–47	\x21–\x2F	\41–\57	!"#$%&'()*+,-./	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
48–57	\x30–\x39	\60–\71	0123456789	0	≠0	0	0	≠0	0	≠0	0	0	0	≠0	≠0
58–64	\x3A–\x40	\72–\100	:;<=>?@	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
65–70	\x41–\x46	\101–\106	ABCDEF	0	≠0	0	0	≠0	0	≠0	≠0	≠0	0	0	≠0
71–90	\x47–\x5A	\107–\132	GHIJKLMNOP QRSTUVWXYZ	0	≠0	0	0	≠0	0	≠0	≠0	≠0	0	0	0
91–96	\x5B–\x60	\133–\140	[\]^_`	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
97–102	\x61–\x66	\141–\146	abcdef	0	≠0	0	0	≠0	0	≠0	≠0	0	≠0	0	≠0
103–122	\x67–\x7A	\147–\172	ghijklmnop qrstuvwxyz	0	≠0	0	0	≠0	0	≠0	≠0	0	≠0	0	0
123–126	\x7B–\x7E	\173–\176	{|}~	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
127	\x7F	\177	backspace character (DEL)	≠0	0	0	0	0	0	0	0	0	0	0	0