prctise .cpp & .h 的拆分

 1 #include <iostream>

 2 using namespace std;

 3 

 4 class People

 5 {

 6 

 7 public:

 8 

 9     People(int age, char sex)  

     { 

     //    cout<<"people's constructor!"<<endl;

     }

     ~People()

     {

     //    cout<<"people's desconstructor!"<<endl;

     }

     void fight(){cout<<"People fighting~~"<<endl;}

     void eat(){cout<<"People eat"<<endl; }

 protected:

     void drink(){cout<<"People drink"<<endl;}

 

 private:

     void sleep(){cout<<"People sleep"<<endl;}

 };

 

 class Man : public People

 { public:

 //若父类的构造函数带参数,则子类在调用父类的构造函数时会出现错误,因为父类的default constructor 已经不再存在了,.

 

 Man():People(23,'m') ,a(1)     {    //no appropriate default constructor available   //给基类的构造函数赋值

     //    cout<<"Man's constructor!"<<endl;

     }

 

     ~Man()

     { 

     //    cout<<"Man's destructor!"<<endl;

     }

     void fight()

     {   People::fight();

         cout<<"Man fighting~~"<<endl;

     }   //相对于People's fight() ，Man's fight()是对它的覆盖，它是发生在父类和子类之间的，而函数的继承是发生在一个类之中的

 

     void test()

     {

         drink();

         // sleep();  //cannot access private member declared in class 'People'

     }

 private:

     const int a;

 };

 

 

 void main()

 {

 //    People man;

 //    man.eat();

     Man zhangsan; 

     zhangsan.fight();

     //zhangsan.eat();

 

 

     //zhangsan.drink();    //cannot access protected member declared in class 'People'

     //fangping.drink();  //cannot access private member declared in class 'People'

     //fangping.sleep();  //cannot access protected member declared in class 'People'

 }