各位高手求帮忙看看纯虚函数

#include<iostream>
using namespace std;

class shape  
{
public:
    shape();
    virtual ~shape();
    virtual void Point::display();
   
  
};
#include<iostream>
using namespace std;
#include"shape.h"

class Point:public shape  
{private:
  float x1;float y1;
public:
    Point();
    virtual ~Point();
    Point(float a,float b):x1(a),y1(b){}

   
    void display()
    {cout<<x1<<","<<y1;}

};

#include "stdafx.h"
#include<iostream>
#include"Point.h"
#include"shape.h"
using namespace std;
int main(int argc, char* argv[])
{Point p(2,3);

   
  p.display();
    printf("Hello World!\n");
    return 0;
}