towupper function — Converts a wide character to uppercase
wint_t towupper(wint_t wc)
The towupper function maps the wide character wc to uppercase. If iswlower(wc) is false, or if wc has no uppercase mapping, wc is returned unchanged.
towupper
wc
iswlower(wc)
towctrans function, towlower function, toupper in <cctype>
toupper
<cctype>