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 );
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 iswxdigitfunction 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. For more information, see Locale.
TCHAR.H routine | _UNICODE & _MBCS not defined | _MBCS defined | _UNICODE defined |
|---|---|---|---|
_istxdigit | isxdigit | isxdigit | iswxdigit |
Routine | Required header |
|---|---|
isxdigit | <ctype.h> |
iswxdigit | <ctype.h> or <wchar.h> |
_isxdigit_l | <ctype.h> |
_iswxdigit_l | <ctype.h> or <wchar.h> |
For additional compatibility information, see Compatibility in the Introduction.
