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isprint, iswprint, _isprint_l, _iswprint_l

Determine if an integer represents a printable character.

int isprint(
   int c 
int iswprint(
   wint_t c 
int _isprint_l(
   int c,
   _locale_t locale
int _iswprint_l(
   wint_t c,
   _locale_t locale


Integer to test.


The locale to use.

Each of these routines returns nonzero if c is a particular representation of a printable character. isprint returns a nonzero value if c is a printable character, including the space character (0x20 – 0x7E). iswprint returns a nonzero value if c is a printable wide character, including the space wide character. Each of these routines returns 0 if c does not satisfy the test condition.

The result of the test condition for these functions depends on the LC_CTYPE category setting of the locale; see setlocale for more information. The versions of these functions without the _l suffix use the current locale for any locale-dependent behavior; the versions with the _l suffix are identical except that they use the locale passed in instead. For more information, see Locale.

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

Generic-Text Routine Mappings

TCHAR.H routine

_UNICODE & _MBCS not defined

_MBCS defined

_unicode defined






Required header




<ctype.h> or <wchar.h>




<ctype.h> or <wchar.h>

For additional compatibility information, see Compatibility in the Introduction.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.