6.12-简单继承.cpp

Visual C++的课件

//Listing 11.1 Simple inheritance

#include <iostream.h>
enum BREED { GOLDEN, CAIRN, DANDIE, SHETLAND, DOBERMAN, LAB };

class Mammal
{
public:
	// constructors
	Mammal();
	~Mammal();

	//accessors
	int	 GetAge()	 const;
	void SetAge(int);
	int	 GetWeight() const;
	void SetWeight();

	//Other methods
	void Speak() const;
	void Sleep() const;


protected:
	int itsAge;
	int itsWeight;
};

class Dog : public Mammal
{
public:

	// Constructors
	Dog();
	~Dog();

	// Accessors
	BREED GetBreed() const;
	void  SetBreed(BREED);

	// Other methods
	WagTail();
	BegForFood();

protected:
	BREED itsBreed;
};