Материал из C\C++ эксперт
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Deriving Abstract Classes from Other Abstract Classes
#include <iostream>
using namespace std;
enum COLOR { Red, Green, Blue, Yellow, White, Black, Brown } ;
class Animal
{
public:
Animal(int);
virtual ~Animal() { cout << "Animal destructor...\n"; }
virtual int GetAge() const { return itsAge; }
virtual void SetAge(int age) { itsAge = age; }
virtual void Sleep() const = 0;
virtual void Eat() const = 0;
virtual void Reproduce() const = 0;
virtual void Move() const = 0;
virtual void Speak() const = 0;
private:
int itsAge;
};
Animal::Animal(int age):
itsAge(age)
{
cout << "Animal constructor..." << endl;
}
class Mammal : public Animal
{
public:
Mammal(int age):Animal(age){ cout << "Mammal constructor..." << endl;}
virtual ~Mammal() { cout << "Mammal destructor..." << endl;}
virtual void Reproduce() const{ cout << "Mammal reproduction depicted..."<<endl; }
};
class Fish : public Animal{
public:
Fish(int age):Animal(age){ cout << "Fish constructor..." << endl;}
virtual ~Fish() {cout << "Fish destructor..." << endl; }
virtual void Sleep() const { cout << "fish snoring..." << endl; }
virtual void Eat() const { cout << "fish feeding..." << endl; }
virtual void Reproduce() const{ cout << "fish laying eggs..." << endl; }
virtual void Move() const{ cout << "fish swimming..." << endl; }
virtual void Speak() const { }
};
class Horse : public Mammal
{
public:
Horse(int age, COLOR color ):
Mammal(age), itsColor(color){ cout << "Horse constructor..." << endl; }
virtual ~Horse() { cout << "Horse destructor..." << endl; }
virtual void Speak()const { cout << "Whinny!... " << endl; }
virtual COLOR GetItsColor() const { return itsColor; }
virtual void Sleep() const{ cout << "Horse snoring..." << endl; }
virtual void Eat() const { cout << "Horse feeding..." << endl; }
virtual void Move() const { cout << "Horse running..." << endl;}
protected:
COLOR itsColor;
};
class Dog : public Mammal
{
public:
Dog(int age, COLOR color ):
Mammal(age), itsColor(color){ cout << "Dog constructor..." << endl; }
virtual ~Dog() { cout << "Dog destructor..." << endl; }
virtual void Speak()const { cout << "Whoof!... " << endl; }
virtual void Sleep() const { cout << "Dog snoring..." << endl; }
virtual void Eat() const { cout << "Dog eating..." << endl; }
virtual void Move() const { cout << "Dog running..." << endl; }
virtual void Reproduce() const{ cout << "Dogs reproducing..." << endl; }
protected:
COLOR itsColor;
};
int main()
{
Animal *pAnimal=0;
pAnimal = new Dog(5,Brown);
pAnimal->Speak();
pAnimal->Eat();
pAnimal->Reproduce();
pAnimal->Move();
pAnimal->Sleep();
delete pAnimal;
pAnimal = new Horse(4,Black);
pAnimal->Speak();
pAnimal->Eat();
pAnimal->Reproduce();
pAnimal->Move();
pAnimal->Sleep();
delete pAnimal;
pAnimal = new Fish (5);
pAnimal->Speak();
pAnimal->Eat();
pAnimal->Reproduce();
pAnimal->Move();
pAnimal->Sleep();
delete pAnimal;
return 0;
}
