int isxdigit( int c );
int iswxdigit( wint_t c );
Each of these routines returns true if c is a particular representation of a hexadecimal digit.
| Routine | Required Header | Compatibility |
| isxdigit | <ctype.h> | ANSI, Win 95, Win NT |
| iswxdigit | <ctype.h> or <wchar.h> | ANSI, Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
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.
Parameter
c
Integer to test
Generic-Text Routine Mappings
| TCHAR.H Routine | _UNICODE & _MBCS Not Defined | _MBCS Defined | _UNICODE Defined |
| _istxdigit | isxdigit | isxdigit | iswxdigit |
Character Classification Routines | Locale Routines | is, isw Function Overview