Compilare: user.cpp: In member function ‘int Stiva::Init()’: user.cpp:30:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In member function ‘int Stiva::Push(int)’: user.cpp:36:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In member function ‘int Stiva::Pop()’: user.cpp:42:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^