#include <iostream>
using namespace std;
 
class Empty
{};
 
class Derived1 : public Empty
{};
 
class Derived2 : virtual public Empty
{};
 
class Derived3 : public Empty
{    
char c;
};
 
class Derived4 : virtual public Empty
{
char c;
};
 
class Dummy
{
 char c;
};
 
int main()
{
 
    cout << "sizeof(Empty) " << sizeof(Empty) << endl;
    cout << "sizeof(Derived1) " << sizeof(Derived1) << endl;
    cout << "sizeof(Derived2) " << sizeof(Derived2) << endl;
    cout << "sizeof(Derived3) " << sizeof(Derived3) << endl;
    cout << "sizeof(Derived4) " << sizeof(Derived4) << endl;    
    cout << "sizeof(Dummy) " << sizeof(Dummy) << endl;
    return 0;
 
}

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