Compilare: user.cpp: In member function ‘char stiva::peek()’: user.cpp:77:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] char peek(){return st[valoare];} ^ user.cpp: In member function ‘void stiva::push(char)’: user.cpp:84:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] st[valoare] = i; ^ user.cpp: In member function ‘char stiva::pop()’: user.cpp:94:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^