isxdigit, iswxdigit, _isxdigit_l, _iswxdigit_l
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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 does not satisfy the test condition.
For the "C" locale, the iswxdigit function does not 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 is not EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c is not one of these values, the functions raise an assertion.
Generic-Text Routine Mappings
| TCHAR.H routine | _UNICODE & _MBCS not defined | _MBCS defined | _UNICODE defined |
|---|---|---|---|
_istxdigit |
isxdigit |
isxdigit |
iswxdigit |
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 additional compatibility information, see Compatibility.