Virtual Functions

#include <iostream>

using namespace std;

class Enemy
{
public:
    virtual void attack(){};
};

class Ninja : public Enemy
{
public:
    void attack()
    {
        cout << "Ninja chop!!" << endl;
    }
};

class Monster : public Enemy
{
    void attack()
    {
        cout << "roar!!" << endl;
    }
};

int main()
{
    Ninja n;
    Monster m;
    Enemy *enemy1 = &n;
    Enemy *enemy2 = &m;
    enemy1 -> attack();
    enemy2 -> attack();
}