110.纯虚函数

#include <iostream>
using namespace std;

class myclass
{
public:
    virtual void go()
    {
        cout << "123" << endl;
    }

    //纯虚函数,有纯虚函数的类不能创建对象
    virtual void run() = 0;
};

class live
{
public:
    //纯虚函数作为接口
    //一旦继承了,必须实现虚函数的接口
    virtual void life() = 0;
    virtual void sleep() = 0;
};

class people :public live
{
public:
    virtual void think() = 0;
};

class birdpeople :public people
{
public:
    virtual void fly()
    {
        cout << "i can fly" << endl;
    }
    void life()
    {
        cout << "i can live every time" << endl;
    }
    void sleep()
    {
        cout << "i can sleep" << endl;
    }
    void think()
    {
        cout << " i can think" << endl;
    }
};

void main()
{
    //myclass *p = new myclass;
    //p->go();
    birdpeople aa;
    cin.get();
}