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isspace, iswspace

int isspace(
   int c 
);
int iswspace(
   wint_t c 
);

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

Parameter

c
Integer to test.

Return Value

isspace returns a non-zero value if c is a white-space character (0x09 – 0x0D or 0x20). The result of the test condition for the isspace function depends on the LC_CTYPE category setting of the current locale; see setlocale for more information.

iswspace returns a non-zero value if c is a wide character that corresponds to a standard white-space character.

When used with a debug CRT library, isspace will display a CRT assert if passed a parameter that isn't EOF or in the range of 0 through 0xFF. When used with a debug CRT library, isspace will use the parameter as an index into an array, with undefined results if the parameter isn't EOF or in the range of 0 through 0xFF.

Generic-Text Routine Mappings

TCHAR.H routine _UNICODE & _MBCS not defined _MBCS defined _UNICODE defined
_istspace isspace _ismbcspace iswspace

Requirements

Routine Required header Compatibility
isspace <ctype.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP
iswspace <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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