towupper - Convert wide character to uppercase

Definition	#include <wctype.h> wint_t towupper(wint_t wc); towupper converts the wide character wc, to the corresponding uppercase letter if wc is a lowercase wide-character code.
Return val.	Uppercase of wc
		if wc is a lowercase letter.
	wc	unchanged if wc is not a lowercase letter.
Note	This version of the C runtime system only supports one-byte characters as wide character codes.
See also	setlocale, toupper, towlower