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__isascii, iswascii

int __isascii( 
   int c 
);
int iswascii( 
   wint_t c 
);

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

Parameter

c
Integer to test.

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.

Generic-Text Routine Mappings

TCHAR.H routine _UNICODE & _MBCS not defined _MBCS defined _UNICODE defined
_istascii isascii isascii iswascii

Requirements

Routine Required header Compatibility
__isascii <ctype.h> Win 98, Win Me, Win NT, Win 2000, Win XP
iswascii <ctype.h> or <wchar.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

See Also

Character Classification Routines | Locale Routines | is, isw Function Overview | Run-Time Routines and .NET Framework Equivalents

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