cpp/locale/ctype/toupper

@1,2@ public member function, calls the protected virtual member function of the most derived class. @3@ Converts the character to upper case if an upper case form is defined by this locale. @4@ For every character in the character array, for which an upper case form exists, replaces the character with that upper case form.

Return value
@1,3@ upper case character or if no upper case form is listed by this locale. @2,4@.