想

#include <iostream>

class Base
{
public:
  int i;
  virtual void Print() { cout << "Base::Print"; }
};

class Derived : public Base
{
public:
  int n;
  virtual void Print() { cout << "Derived::Print" << endl;}
}

int main()
{
  Derived d;
  cout << sizeof(Base) << "," << sizeof(Derived);
  reuturn 0;
}