動物世界

1、實現Mammal類的方法

2、由Mammal類派生出Dog類，在Dog類中增加itsColor成員(COLOR類型)

3、Dog類中增加以下方法：

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() ，並實現以上這些方法 。

提示：類似Speak()、WagTail()這些動作，函數體可以是輸出一句話。比如：Mammal is spaeking... , The Dog is Wagging its tail...

4、補充主函數的問號部分，並運行程序，檢查輸出是否合理。

#include<iostream>
using namespace std;
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;
};
Mammal::Mammal(){}//定義構造函數
Mammal::Mammal(int age):itsAge(age){}
Mammal::~Mammal(){}
int Mammal::GetAge() const//用於獲取itsAge
{
  return itsAge;
}
void Mammal::SetAge(int age)//用於設置itsAge
{
  itsAge=age;
}
int Mammal::GetWeight() const//用於獲取itsWeight
{
  return itsWeight;
}
void Mammal::SetWeight(int weight)//用於設置itsWeight
{
  itsWeight=weight;
}
void Mammal::Speak() const//成員函數
{
  cout<<"Mammal is speaking..."<<endl;
}
void Mammal::Sleep() const//成員函數
{
  cout<<"Mammal is sleeping..."<<endl;
}

class Dog:public Mammal//定義Dog類，繼承Mammal類
{
private:
  COLOR itsColor;//設置顏色為私有屬性，類型為枚舉COLOR類型
public:
  Dog();
  Dog(int age);
  Dog(int age,int weight);
  Dog(int age,COLOR color);
  Dog(int age,int weight,COLOR color);
  ~Dog();
  COLOR GetColor();
  void SetColor(COLOR color);
  void WagTail();
  void BegForFood();
};
Dog::Dog(){}//定義構造函數
Dog::Dog(int age):Mammal(age){}//調用基類的構造函數
Dog::Dog(int age,int weight):Mammal(age)
{
  this->SetWeight(weight);
}
Dog::Dog(int age,COLOR color):Mammal(age)
{
  this->itsColor=color;
}
Dog::Dog(int age,int weight,COLOR color):Mammal(age)
{
  this->SetWeight(weight);
  this->itsColor=color;
}
Dog::~Dog(){}//定義析構函數
COLOR Dog::GetColor()//獲取對象的itsColor值
{
  return itsColor;
}
void Dog::SetColor(COLOR color)//設置對象的itsCokor值
{
  itsColor=color;
}
void Dog::WagTail()//定義成員函數
{
  cout<<"The dog is wagging its tail..."<<endl;
}
void Dog::BegForFood()//定義成員函數
{
  cout<<"The dog is begging its food..."<<endl;
}
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;
}

 構造函數和析構函數只聲明不定義會報錯