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isupper, iswupper

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intisupper(intc**);**

intiswupper(wint_tc**);**

Each of these routines returns true if c is a particular representation of an uppercase letter.

Routine Required Header Compatibility
isupper <ctype.h> ANSI, Win 95, Win NT
iswupper <ctype.h> or <wchar.h> ANSI, Win 95, Win NT

For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version

Return Value

isupper returns a non-zero value if c is an uppercase character (a – z). iswupper returns a non-zero 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 true. Each of these routines returns 0 if c does not satisfy the test condition.

The result of the test condition for the isupper function depends on the LC_CTYPE category setting of the current locale; see setlocale for more information. For iswupper, the result of the test condition is independent of locale.

Parameter

c

Integer to test

Generic-Text Routine Mappings

TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined
_istupper isupper _ismbcupper iswupper

Character Classification Routines |  Locale Routines |  is, isw Function Overview