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isxdigit, iswxdigit

int isxdigit(
   int c 
);
int iswxdigit(
   wint_t c 
);

Each of these routines returns nonzero if c is a particular representation of a hexadecimal digit.

Parameter

c
Integer to test.

Return Value

isxdigit returns a non-zero value if c is a hexadecimal digit (A – F, a – f, or 0 – 9). iswxdigit returns a non-zero 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.

The result of the test condition for the isxdigit function depends on the LC_CTYPE category setting of the current locale; see setlocale for more information. For the "C" locale, the iswxdigit function does not provide support for Unicode fullwidth hexadecimal characters. The result of the test condition for iswxdigit is independent of any other locale.

When used with a debug CRT library, isxdigit will display a CRT assert if passed a parameter that isn't 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 isn't EOF or in the range of 0 through 0xFF.

Generic-Text Routine Mappings

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

Requirements

Routine Required header Compatibility
isxdigit <ctype.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP
iswxdigit <ctype.h> or <wchar.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

See Also

Character Classification Routines | Locale Routines | is, isw Function Overview | Run-Time Routines and .NET Framework Equivalents

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