isxdigit-iswxdigit-isxdigit-l-iswxdigit-l.md

description	title	ms.date	api_name	api_location	api_type	topic_type	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: isxdigit, iswxdigit, _isxdigit_l, _iswxdigit_l	isxdigit, iswxdigit, _isxdigit_l, _iswxdigit_l	4/2/2020	_iswxdigit_l iswxdigit isxdigit _isxdigit_l _o_iswxdigit _o_isxdigit	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll api-ms-win-crt-string-l1-1-0.dll ntoskrnl.exe	DLLExport	apiref	iswxdigit isxdigit _istxdigit	isxdigit function istxdigit function _iswxdigit_l function _istxdigit function _isxdigit_l function iswxdigit_l function isxdigit_l function hexadecimal characters iswxdigit function	c8bc5146-0b58-4e3f-bee3-f2318dd0f829

isxdigit, iswxdigit, _isxdigit_l, _iswxdigit_l

Determines whether an integer represents a character that is a hexadecimal digit.

Syntax

int isxdigit(
   int c
);
int iswxdigit(
   wint_t c
);
int _isxdigit_l(
   int c,
   _locale_t locale
);
int _iswxdigit_l(
   wint_t c,
   _locale_t locale
);

Parameters

c
Integer to test.

locale
Locale to use.

Return value

Each of these routines returns nonzero if c is a particular representation of a hexadecimal digit. isxdigit returns a nonzero value if c is a hexadecimal digit (A - F, a - f, or 0 - 9). iswxdigit returns a nonzero value if c is a wide character that corresponds to a hexadecimal digit character. Each of these routines returns 0 if c doesn't satisfy the test condition.

For the "C" locale, the iswxdigit function doesn't support Unicode full-width hexadecimal characters.

The versions of these functions that have the _l suffix use the locale that's passed in instead of the current locale for their locale-dependent behavior. For more information, see Locale.

The behavior of isxdigit and _isxdigit_l is undefined if c isn't EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c isn't one of these values, the functions raise an assertion.

Generic-text routine mappings

TCHAR.H routine	_UNICODE and _MBCS not defined	_MBCS defined	_UNICODE defined
_istxdigit	isxdigit	isxdigit	iswxdigit

Remarks

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Requirements

Routine	Required header
isxdigit	<ctype.h>
iswxdigit	<ctype.h> or <wchar.h>
_isxdigit_l	<ctype.h>
_iswxdigit_l	<ctype.h> or <wchar.h>

For more compatibility information, see Compatibility.

See also

Character classification
Locale
is, isw routines