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isxdigit, iswxdigit, _isxdigit_l, _iswxdigit_l 

Determine if an integer represents character that is a hex digit.


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.

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 does not satisfy the test condition.

For the "C" locale, the iswxdigit function does not provide support for Unicode full width hexadecimal characters.

When used with a debug CRT library, isxdigit will display a CRT assert if passed a parameter that is not EOF or in the range of 0 through 0xFF. When used with a debug CRT library, isxdigit will use the parameter as an index into an array, with undefined results if the parameter is not EOF or in the range of 0 through 0xFF.

The versions of these functions with the _l suffix are identical except that they use the locale passed in instead of the current locale for their locale-dependent behavior.

Generic-Text Routine Mappings
TCHAR.H routine _UNICODE & _MBCS not defined _MBCS defined _UNICODE defined

_istxdigit

isxdigit

isxdigit

iswxdigit

Routine Required header Compatibility

isxdigit

<ctype.h>

ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

iswxdigit

<ctype.h> or <wchar.h>

ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

_isxdigit_l

<ctype.h>

Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

_iswxdigit_l

<ctype.h> or <wchar.h>

Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For additional compatibility information, see Compatibility in the Introduction.

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