#include<iostream>

#include"Circle.h"

#include"Rect.h"

#include"Shape.h"

using namespace std;

int main()

{

Shape *shape1 =new Rect(4,5);

Shape *shape2 = new Circle(6);

shape1->calcArea();

shape2->calcArea();

delete shape1;

shape1 = NULL;

delete shape2;

shape2 = NULL;

system("pause");

return 0;

}

运行结果shape1中不跳至Rect类,为什么啊