Compilare: user.cpp: In member function ‘int Stiva::Init()’: user.cpp:25:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In member function ‘int Stiva::Push(int)’: user.cpp:31:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In member function ‘int Stiva::Pop()’: user.cpp:37:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:64:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1 ;i < strlen(c); i++) ^