#include <iostream>
  
class Mammal
{
public:
    Mammal():age(1) {  }
    ~Mammal() { }
    virtual void speak() const { std::cout << "Mammal speak!\n"; }
protected:
    int age;
};
  
class Dog : public Mammal
{
public:
    void speak() const { std::cout << "Woof!\n"; }
};
  
class Cat : public Mammal
{
public:
    void speak() const { std::cout << "Meow!\n"; }
};
  
class Horse : public Mammal
{
public:
    void speak() const { std::cout << "Whinny!\n"; }
};
  
class Pig : public Mammal
{
public:
    void speak() const { std::cout << "Oink!\n"; }
};

int main()
{
    Mammal* array[5];
    Mammal* ptr;
    int choice, i;
    for (i = 0; i < 5; i++)
    {
        std::cout << "(1) dog (2) cat (3) horse (4) pig: ";
        std::cin >> choice;
        switch (choice)
        {
        case 1: 
            ptr = new Dog;
            break;
        case 2: 
            ptr = new Cat;
            break;
        case 3: 
            ptr = new Horse;
            break;
        case 4: 
            ptr = new Pig;
            break;
        default: 
            ptr = new Mammal;
            break;
        }
        array[i] = ptr;
    }
    for (i=0; i < 5; i++)
    {
        array[i]->speak();
    }
    return 0;
}