The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.
We recommend using Visual Studio 2017

isspace, iswspace, _isspace_l, _iswspace_l


The new home for Visual Studio documentation is Visual Studio 2017 Documentation on

The latest version of this topic can be found at isspace, iswspace, _isspace_l, _iswspace_l.

Determines whether an integer represents a space character.

int isspace(  
   int c   
int iswspace(  
   wint_t c   
int _isspace_l(  
   int c,  
   _locale_t locale  
int _iswspace_l(  
   wint_t c,  
   _locale_t locale  


Integer to test.

Locale to use.

Each of these routines returns nonzero if c is a particular representation of a space character. isspace returns a nonzero 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 locale; see setlocale, _wsetlocale for more information. The versions of these functions that do not have the _l suffix use the current locale for any locale-dependent behavior; the versions that do have the _l suffix are identical except that they use the locale that's passed in instead. For more information, see Locale.

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

The behavior of isspace and _isspace_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 & _MBCS not defined_MBCS defined_UNICODE defined
_ istspaceisspace_ismbcspaceiswspace
RoutineRequired header
iswspace<ctype.h> or <wchar.h>
_iswspace_l<ctype.h> or <wchar.h>

For additional compatibility information, see Compatibility.


Character Classification
is, isw Routines