PTA:7-4 动物世界

补充程序 ：
1、实现Mammal类的方法
2、由Mammal类派生出Dog类，在Dog类中增加itsColor成员(COLOR类型)
3、Dog类中增加以下方法：
constructors: Dog()、Dog(int age)、Dog(int age, int weight)、Dog(int age, COLOR color)、 Dog(int age, int weight, COLOR color)、~Dog()
accessors: GetColor()、SetColor()
Other methods: WagTail()、BegForFood() ，并实现以上这些方法 。
提示：类似Speak()、WagTail()这些动作，函数体可以是输出一句话。比如：Mammal is spaeking… , The Dog is Wagging its tail…
4、补充主函数的问号部分，并运行程序，检查输出是否合理。

enum COLOR{ WHITE, RED, BROWN, BLACK, KHAKI };
class Mammal
{
	public:
		//constructors
		Mammal();
		Mammal(int age);
		~Mammal();
		//accessors
		int GetAge() const;
		void SetAge(int);
		int GetWeight() const;
		void SetWeight(int);
		
		//Other methods	
		void Speak() const;
		void Sleep() const;		
	protected:
		int itsAge;
		int itsWeight;
};

int main()
{
	Dog Fido;
	Dog Rover(5);
	Dog Buster(6, 8);
	Dog Yorkie(3, RED);
	Dog Dobbie(4, 20, KHAKI);
	Fido.Speak();
	Rover.WagTail();
	cout << "Yorkie is " << ?? << " years old." << endl;
	cout << "Dobbie	weighs " << ?? << " pounds." << endl;   
	return 0;
}

补充完整程序如下

#include<iostream>
using namespace std;

enum COLOR{ WHITE, RED, BROWN, BLACK, KHAKI };//枚举颜色

class Mammal
{
	public:
		//constructors
		Mammal(){}
		Mammal(int age):itsAge(age){}
		Mammal(int age,int w):itsAge(age),itsWeight(w){}
		~Mammal(){}
		
		//accessors
		int GetAge() const{return itsAge;}	//补充所有函数
		void SetAge(int a){itsAge = a;}
		int GetWeight() const{return itsWeight;}
		void SetWeight(int w){itsWeight = w;}
		
		//Other methods	
		void Speak() const{cout<< "Mammal is speaking..." <<endl;}
	
	protected:
		int itsAge;
		int itsWeight;
		
};

class Dog:public Mammal	//Dog继承Mammal类
{
	public:
		Dog():Mammal(0, 0){}
		Dog(int age):Mammal(age){}
		Dog(int age, int w):Mammal(age, w){}
		Dog(int age, int w, enum COLOR c):Mammal(age, w), color(c){}
	    void WagTail() const{cout<< "The dog is wagging its tail..." <<endl;}	//新增狗摇尾巴函数
	protected:
		enum COLOR color;//定义color
};

int main()
{
	Dog Fido;
	Dog Rover(5);
	Dog Buster(6, 8);
	Dog Yorkie(3, RED);
	Dog Dobbie(4, 20, KHAKI);
	Fido.Speak();
	Rover.WagTail();
	cout << "Yorkie is " <<Yorkie.GetAge()<< " years old." << endl;
	cout << "Dobbie weighs " << Dobbie.GetWeight() << " pounds." << endl;   
	return 0;
}