int iscntrl( int c );
int iswcntrl( wint_t c );
Each of these routines returns true if c is a particular representation of a control character.
| Routine | Required Header | Compatibility |
| iscntrl | <ctype.h> | ANSI, Win 95, Win NT |
| iswcntrl | <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
iscntrl returns a non-zero value if c is a control character (0x00 – 0x1F or 0x7F). iswcntrl returns a non-zero value if c is a control wide character. Each of these routines returns 0 if c does not satisfy the test condition.
The result of the test condition for the iscntrl function depends on the LC_CTYPE category setting of the current locale; see setlocale for more information. For iswcntrl, the result of the test condition is independent of locale.
Parameter
c
Integer to test
Generic-Text Routine Mappings
| TCHAR.H Routine | _UNICODE & _MBCS Not Defined | _MBCS Defined | _UNICODE Defined |
| _istcntrl | iscntrl | iscntrl | iswcntrl |
Character Classification Routines | Locale Routines | is, isw Function Overview