C++-PTA-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。

#include <iostream>
using namespace std;
enum COLOR{ WHITE, RED, BROWN, BLACK, KHAKI };

class Mammal
{
private:
    
public:
        //constructors
    Mammal(){}
    Mammal(int age):itsAge(age){}
    ~Mammal(){}
        
        //accessors
    int GetAge()        const{return itsAge;}
    void SetAge(int age)     {itsAge = age;}
    int GetWeight()      {return itsWeight;}
    void SetWeight(int weight)     {itsWeight=weight;}
        
        //Other methods
    void Speak()    const
    {cout<<"Mammal is speaking..."<<endl;}
    void Sleep() const;
protected:
    int itsAge;
    int itsWeight;
};
class Dog:public Mammal
{
private:
    COLOR itsColor;
public:
    Dog(){}
    //    {itsAge=1;itsWeight=10;}
    Dog(int age):Mammal(age)
    {}
    Dog(int age, int w):Mammal(age)
    {itsWeight=w;}
    Dog(int age, COLOR color):Mammal(age)
    {color=WHITE;}
    Dog(int age, int w,COLOR color):Mammal(age)
    {itsColor=color;itsWeight=w;}
    ~Dog(){}
    COLOR GetColor()    {return itsColor;}
    void SetColor(COLOR color)  {itsColor=color;}
    void WagTail()  {cout<<"The dog is wagging its tail..."<<endl;}
    void BegForFood() ;
};
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;
}

不知道为什么输出结果不对……

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2020-05-18 已更正