towupper—translate wide characters to uppercase #include <wctype.h>
wint_t towupper(wint_t c);
Description
towupper is a function which converts lowercase wide characters to
uppercase, leaving all other characters unchanged.
Returns
towupper returns the uppercase equivalent of c when it is a
lowercase wide character, otherwise, it returns the input character.
Portability
towupper is C99.
No supporting OS subroutines are required.