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isupper, _isupper_l, iswupper, _iswupper_l

Determines if a particular character is in upper case.

int isupper(
   int c 
);
int _isupper_l (
   int c,
   _locale_t locale
);
int iswupper(
   wint_t c 
);
int _iwsupper_l(
   wint_t c,
   _locale_t locale 
);

c

Integer to test.

locale

Locale to use.

Each of these routines returns nonzero if c is a particular representation of an uppercase letter. isupper returns a nonzero value if c is an uppercase character (A – Z). iswupper returns a nonzero value if c is a wide character that corresponds to an uppercase letter, or if c is one of an implementation-defined set of wide characters for which none of iswcntrl, iswdigit, iswpunct, or iswspace is nonzero. Each of these routines returns 0 if c does not satisfy the test condition.

When used with a debug CRT library, isupper 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 debug CRT library, isupper 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.

The versions of these functions with the _l suffix are identical except that they use the locale passed in instead of the current locale for their locale-dependent behavior. For more information, see Locale.

Generic-Text Routine Mappings

TCHAR.H routine

_UNICODE & _MBCS not defined

_MBCS defined

_UNICODE defined

_istupper

isupper

_ismbcupper

iswupper

_istupper_l

_isupper_l

_ismbclower, _ismbclower_l, _ismbcupper, _ismbcupper_l

_iswupper_l

Routine

Required header

isupper

<ctype.h>

_isupper_l

<ctype.h>

iswupper

<ctype.h> or <wchar.h>

_iswupper_l

<ctype.h>

For additional compatibility information, see Compatibility in the Introduction.

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