#include<iostream>
using namespace std;

class Base {
    public:
    void show()
    { cout << "Base\n"; }
};
class Derv1 : public Base {
    public:
    void show()
    { cout << "Derv1\n"; }
};
class Derv2 : public Base //derived class 2
{
    public:
    void show()
    { cout << "Derv2\n"; }
};
main()
{
    Derv1 dv1; //object of derived class 1
    Derv2 dv2; //object of derived class 2
    Base* ptr; //pointer to base class
    ptr = &dv1; //put address of dv1 in pointer
    ptr->show(); //execute show()
    ptr = &dv2; //put address of dv2 in pointer
    ptr->show(); //execute show()
    system("pause");
}