#include <iostream>
using namespace std;
 
class A {protected: double x,y;
public:virtual void show(){cout << x+y << endl;}
A(double x=1, double y=2){A::x=x;A::y=y;}};
 
class B: public A {protected: int x,y;
public:void show(){cout << x-y << endl;}
B(int x=3, int y=4){B::x=x;B::y=y;}};
 
class C: public B {unsigned x,y;
public: void show(){cout << x*y << endl;}
C(unsigned x=5, unsigned y=6){C::x=x;C::y=y;}};
 
int main()
{ A a, *p; B b; C c;
(p=&b)->show();
return 0; }
 

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