iswupper - Test for uppercase wide character

Definition	#include <wctype.h> int iswupper(wint_t wc); iswupper tests whether the wide character wc is an uppercase letter. In all cases, wc is an argument of type wint_t, the value of which must be a wide character code corresponding to a valid character in the current locale or must equal the value of the macro WEOF. If the argument wc has any other value, the behavior is undefined.
Return val.	!= 0 0	wc is an uppercase letter. wc is not an uppercase letter.
Notes	This version of the C runtime system only supports one-byte characters as wide character codes. iswupper is implemented both as a function and as a macro (see see section “Functions and macros”). The behavior of iswupper is determined by the class upper of the current locale. The current locale is the C locale, unless it was explicitly changed using setlocale.
See also	isupper, iswalnum, iswalpha, iswcntrl, iswdigit, iswgraph, iswlower, iswprint, iswpunct, iswspace, iswxdigit, setlocale