指向派生类型的指针

#include<iostream>
using namespace std;

class base{
 int a,b;
public:
 void set_ab(int x,int y){this->a=x;b=y;}
 void show(){cout<<"a  and  b is "<<a<<"/t"<<b<<endl;}
};

class derived:public base{
 int c;
public:
 void set_c(int x){c=x;}
 void show_c(){cout<<"c is "<<c<<endl;}
};

int main()
{
 derived cl;
 base *p;
 cl.set_ab(1,2);
 cl.set_c(3);
 p=&cl;
 p->show();
 return 0;
}

测试结果：

a  and  b is 1  2
Press any key to continue