无法在多态关系上获得正确的雄辩关联

class Shape {
public:
    virtual double area() = 0;
};

class Circle : public Shape {
private:
    double radius;
public:
    Circle(double r) : radius(r) {}

    double area() override {
        return 3.14 * radius * radius;
    }
};

class Rectangle : public Shape {
private:
    double width;
    double height;
public:
    Rectangle(double w, double h) : width(w), height(h) {}

    double area() override {
        return width * height;
    }
};

int main() {
    Shape* shape1 = new Circle(5.0);
    Shape* shape2 = new Rectangle(4.0, 6.0);

    double area1 = shape1->area(); // 调用圆形类的area()函数
    double area2 = shape2->area(); // 调用矩形类的area()函数

    delete shape1;
    delete shape2;

    return 0;
}