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#include <iostream>
class A {
public:
virtual int f(int x);
};
int A::f(int x) { return x; }
class B : public A {
public:
};
class C : public B {
public:
virtual int f(int x);
};
int C::f(int x) { return 3*x; }
int main() {
A *a = new A();
std::cout << a->f(1) << "\n";
B *b = new B();
std::cout << b->f(1) << "\n";
C *c = new C();
std::cout << c->f(1) << "\n";
a = b;
std::cout << a->f(1) << "\n";
a = c;
std::cout << a->f(1) << "\n";
b = c;
std::cout << b->f(1) << "\n";
}
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