4elist1403.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 14.3. Multiple inheritance.
// Multiple Inheritance

#include <iostream>
using std::cout;
using std::cin;

class Horse
{
public:
	Horse() { cout << "Horse constructor... "; }
	virtual ~Horse() { cout << "Horse destructor... "; }
	virtual void Whinny() const { cout << "Whinny!... "; }
private:
	int itsAge;
};

class Bird
{
public:
	Bird() { cout << "Bird constructor... "; }
	virtual ~Bird() { cout << "Bird destructor... "; }
	virtual void Chirp() const { cout << "Chirp... ";  }
	virtual void Fly() const
	{
		cout << "I can fly! I can fly! I can fly! ";
	}
private:
	int itsWeight;
};

class Pegasus : public Horse, public Bird
{
public:
	void Chirp() const { Whinny(); }
	Pegasus() { cout << "Pegasus constructor... "; }
	~Pegasus() { cout << "Pegasus destructor...  "; }
};

const int MagicNumber = 2;
int main()
{
	Horse* Ranch[MagicNumber];
	Bird* Aviary[MagicNumber];
	Horse * pHorse;
	Bird * pBird;
	int choice,i;
	for (i=0; i<MagicNumber; i++)
	{
		cout << "\n(1)Horse (2)Pegasus: ";
		cin >> choice;
		if (choice == 2)
			pHorse = new Pegasus;
		else
			pHorse = new Horse;
		Ranch[i] = pHorse;
	}
	for (i=0; i<MagicNumber; i++)
	{
		cout << "\n(1)Bird (2)Pegasus: ";
		cin >> choice;
		if (choice == 2)
			pBird = new Pegasus;
		else
			pBird = new Bird;
		Aviary[i] = pBird;
	}

	cout << "\n";
	for (i=0; i<MagicNumber; i++)
	{
		cout << "\nRanch[" << i << "]: " ;
		Ranch[i]->Whinny();
		delete Ranch[i];
	}

	for (i=0; i<MagicNumber; i++)
	{
		cout << "\nAviary[" << i << "]: " ;
		Aviary[i]->Chirp();
		Aviary[i]->Fly();
		delete Aviary[i];
	}
	return 0;
}