4elist1410.cpp

《21天学通C＋＋》附盘的原代码。书上的每个例子在这里都有相应的C语言程序。

// Listing 14.10
// Deriving ADTs from other ADTs
#include <iostream>
using namespace std;

enum COLOR { Red, Green, Blue, Yellow, White, Black, Brown } ;

class Animal        // common base to both Mammal and Fish
{
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...\n";
}

class Mammal : public Animal
{
public:
	Mammal(int age):Animal(age)
		{ cout << "Mammal constructor...\n";}
	virtual ~Mammal() { cout << "Mammal destructor...\n";}
	virtual void Reproduce() const
		{ cout << "Mammal reproduction depicted...\n"; }
};

class Fish : public Animal
{
public:
	Fish(int age):Animal(age)
		{ cout << "Fish constructor...\n";}
	virtual ~Fish() {cout << "Fish destructor...\n";  }
	virtual void Sleep() const { cout << "fish snoring...\n"; }
	virtual void Eat() const { cout << "fish feeding...\n"; }
	virtual void Reproduce() const
		{ cout << "fish laying eggs...\n"; }
	virtual void Move() const
		{ cout << "fish swimming...\n";   }
	virtual void Speak() const { }
};

class Horse : public Mammal
{
public:
	Horse(int age, COLOR color ):
	Mammal(age), itsColor(color)
		{ cout << "Horse constructor...\n"; }
	virtual ~Horse() { cout << "Horse destructor...\n"; }
	virtual void Speak()const { cout << "Whinny!... \n"; }
	virtual COLOR GetItsColor() const { return itsColor; }
	virtual void Sleep() const
		{ cout << "Horse snoring...\n"; }
	virtual void Eat() const { cout << "Horse feeding...\n"; }
	virtual void Move() const { cout << "Horse running...\n";}

protected:
	COLOR itsColor;
};

class Dog : public Mammal
{
public:
	Dog(int age, COLOR color ):
	Mammal(age), itsColor(color)
		{ cout << "Dog constructor...\n"; }
	virtual ~Dog() { cout << "Dog destructor...\n"; }
	virtual void Speak()const { cout << "Whoof!... \n"; }
	virtual void Sleep() const { cout << "Dog snoring...\n"; }
	virtual void Eat() const { cout << "Dog eating...\n"; }
	virtual void Move() const  { cout << "Dog running...\n"; }
	virtual void Reproduce() const
		{ cout << "Dogs reproducing...\n"; }

protected:
	COLOR itsColor;
};

int main()
{
	Animal *pAnimal=0;
	int choice;
	bool fQuit = false;

	while (1)
	{
		cout << "(1)Dog (2)Horse (3)Fish (0)Quit: ";
		cin >> choice;

		switch (choice)
		{
		case 1: pAnimal = new Dog(5,Brown);
				break;
		case 2: pAnimal = new Horse(4,Black);
				break;
		case 3: pAnimal = new Fish (5);
				break;
		default: fQuit = true;
				break;
		}
		if (fQuit)
			break;

		pAnimal->Speak();
		pAnimal->Eat();
		pAnimal->Reproduce();
		pAnimal->Move();
		pAnimal->Sleep();
		delete pAnimal;
		cout << "\n";
	}
	return 0;
}