_isctype, iswctype, _isctype_l, _iswctype_l


For the latest documentation on Visual Studio 2017, see Visual Studio 2017 Documentation.

Tests c for the property specified by the desc argument. For each valid value of desc, there is an equivalent wide-character classification routine.

int _isctype(  
   int c,  
   _ctype_t desc  
int _isctype_l(  
   int c,  
   _ctype_t desc,  
   _locale_t locale  
int iswctype(  
   wint_t c,  
   wctype_t desc   
int _iswctype_l(  
   wint_t c,  
   wctype_t desc,  
   _locale_t locale  


Integer to test.

Property to test for. This is normally retrieved using ctype or wctype.

The locale to use for any locale-dependent tests.

_isctype and iswctype return a nonzero value if c has the property specified by desc in the current locale or 0 if it does not. 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.

The behavior of _isctype and _isctype_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 and _MBCS not defined_MBCS defined_UNICODE defined
RoutineRequired header
iswctype<ctype.h> or <wchar.h>
_iswctype_l<ctype.h> or <wchar.h>

For more compatibility information, see Compatibility in the Introduction.

All versions of the C run-time libraries.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

Character Classification
is, isw Routines