虚函数实现多态

#include <iostream>
 
 

  #include <string.h>
 
 

  using namespace std;
 
 

  
 

  /*  虚函数实现多态
 
 

  class Student
 
 

  {
 
 

  public:
 
 
 
 
 {
 
 
 cout<<"Student virtual"<<endl;
 
 
 }
 
 

  };
 
 

  class Purple:public Student
 
 

  {
 
 

  public:
 
 
 virtual void say()
 
 
 {
 
 
 cout<<"Purple virtual"<<endl;
 
 
 }
 
 

  };
 
 

  class High:public Student
 
 

  {
 
 

  public:
 
 
 virtual void say()
 
 
 {
 
 
 cout<<"High virtual"<<endl;
 
 
 }
 
 

  };
 
 

  */
 
 

  
 

  class Student
 
 

  {
 
 

  public:
 
 
 
 
 {
 
 
 cout<<"Student virtual"<<endl;
 
 
 }
 
 

  };
 
 

  class Purple:public Student
 
 

  {
 
 

  public:
 
 
 void say()
 
 
 {
 
 
 cout<<"Purple virtual"<<endl;
 
 
 }
 
 

  };
 
 

  class High:public Student
 
 

  {
 
 

  public:
 
 
 void say()
 
 
 {
 
 
 cout<<"High virtual"<<endl;
 
 
 }
 
 

  };
 
 

  void main()
 
 

  {
 
 
 Purple p;
 
 
 p.say();
 
 

  
 
 High h;
 
 
 h.say();
 
 

  
 
 Student* ps=new Purple();
 
 
 ps->say();
 
 

  
 
 Student* ph=new High();
 
 
 ph->say();
 
 
 
 
 return;
 
 

  }