isupper, _isupper_l, iswupper, _iswupper_l
Determines whether an integer represents an uppercase character.
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 );
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.
The versions of these functions that have the _l suffix use the locale that's passed in instead of the current locale for their locale-dependent behavior. For more information, see Locale.
The behavior of isupper and _isupper_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.
|
TCHAR.H routine |
_UNICODE & _MBCS not defined |
_MBCS defined |
_UNICODE defined |
|---|---|---|---|
|
_istupper |
isupper |
iswupper |
|
|
_istupper_l |
_isupper_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.
