#include <iostream>
class Animal
{
public:
Animal():itsAge(1) { }
~Animal() { }
virtual void Speak() const { std::cout << "Animal speak!\n"; }
protected:
int itsAge;
};
class Dog : public Animal
{
public:
void Speak()const { std::cout << "Woof!\n"; }
};
class Cat : public Animal
{
public:
void Speak()const { std::cout << "Meow!\n"; }
};
void ValueFunction (Animal);
void PtrFunction (Animal*);
void RefFunction (Animal&);
int main()
{
Animal* ptr=0;
int choice;
ptr = new Dog;
PtrFunction(ptr);
RefFunction(*ptr);
ValueFunction(*ptr);
ptr = new Cat;
PtrFunction(ptr);
RefFunction(*ptr);
ValueFunction(*ptr);
ptr = new Animal;
PtrFunction(ptr);
RefFunction(*ptr);
ValueFunction(*ptr);
return 0;
}
void ValueFunction (Animal AnimalValue)
{
AnimalValue.Speak();
}
void PtrFunction (Animal * pAnimal)
{
pAnimal->Speak();
}
void RefFunction (Animal & rAnimal)
{
rAnimal.Speak();
}
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