#include <iostream>
using namespace std;
struct A
{
    void f()
    {
        cout << "A::f\n";
        g();
        h();
    }
    virtual void g() { cout << "A::g\n"; }
    void h() { cout << "A::h\n"; }
};
struct B : A
{
    void g() { cout << "B::g\n"; }
    virtual void h() { cout << "B::h\n"; }
};
struct C : B
{
    virtual void g() { cout << "C::g\n"; }
    virtual void h() { cout << "C::h\n"; }
};
int main()
{
    B b;
    C c;
    B *z = new C;
    b.f();
    z->g();
    z->h();
    c.f();
    delete z;
}