#include <iostream>

using namespace std;

struct B
{
  void f() { cout << "B"; }
};

struct C: B
{
  void f() { cout << "C"; }
};

int main()
{
  C c;

  B *b1 = &c;
  b1->f();

  B b2 = c;
  b2.f();
  return 0;
}