__isascii, iswascii

Visual Studio 6.0

int __isascii( int c );

int iswascii( wint_t c );

Each of these routines returns true if c is a particular representation of an ASCII character.

Routine Required Header Compatibility
__isascii <ctype.h> Win 95, Win NT
iswascii <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

__isascii returns a non-zero value if c is an ASCII character (in the range 0x00 – 0x7F). iswascii returns a non-zero value if c is a wide-character representation of an ASCII character. Each of these routines returns 0 if c does not satisfy the test condition.

The result of the test condition for the __isascii function depends on the LC_CTYPE category setting of the current locale; see setlocale for more information. For iswascii, 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
_istascii __isascii __isascii iswascii

Character Classification RoutinesLocale Routinesis, isw Function Overview

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