isxdigit, iswxdigit, _isxdigit_l, _iswxdigit_l
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 doesn't satisfy the test condition.
For the "C" locale, the iswxdigit function doesn't 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 isn't EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c isn't one of these values, the functions raise an assertion.
Generic-text routine mappings
| TCHAR.H routine | _UNICODE and _MBCS not defined |
_MBCS defined |
_UNICODE defined |
|---|---|---|---|
_istxdigit |
isxdigit |
isxdigit |
iswxdigit |
Remarks
By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.
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 more compatibility information, see Compatibility.