int main() { Rectangle recA(7.2,3.5), recB(7.2,3.5); Circle circleA(2.3), circleB(1.5); Shape *pShape[4]={&recB, &circleA, &circleB, &recA}; for( int i=0; i<4; i++) { pShape[i]->print(); cout<<"Area="<< pShape[i]->getArea()<<" Perimeter="<< pShape[i]->getPerimeter()<<endl; } return 0; } 它的主函数为上面代码，请补充之前的代码

好的，这里需要补充的代码如下：

#include <iostream>
#include <cmath>

using namespace std;

// 定义抽象类 Shape
class Shape {
public:
    virtual double getArea() = 0;
    virtual double getPerimeter() = 0;
    virtual void print() = 0;
};

// 定义 Circle 类
class Circle : public Shape {
private:
    double r;
public:
    Circle(double r) : r(r) {}
    double getArea() { return M_PI * r * r; }
    double getPerimeter() { return 2 * M_PI * r; }
    void print() { cout << "Circle: R=" << r << "  "; }
};

// 定义 Rectangle 类
class Rectangle : public Shape {
private:
    double width, height;
public:
    Rectangle(double width, double height) : width(width), height(height) {}
    double getArea() { return width * height; }
    double getPerimeter() { return 2 * (width + height); }
    void print() { cout << "Rectangle: Width=" << width << ",Height=" << height << "  "; }
};

这里我们定义了一个抽象类 Shape，里面包含了纯虚函数 getArea() 和 getPerimeter()，以及虚函数 print()。然后我们在 Circle 和 Rectangle 类中继承了 Shape 类，并实现了相应的虚函数。

接下来是主函数代码，它可以输出每个图形的类型、参数以及面积和周长：

int main() {
    Rectangle recA(7.2, 3.5), recB(7.2, 3.5);
    Circle circleA(2.3), circleB(1.5);

    Shape *pShape[4] = {&recB, &circleA, &circleB, &recA};

    for (int i = 0; i < 4; i++) {
        pShape[i]->print();
        cout << "Area=" << pShape[i]->getArea() << "  Perimeter=" << pShape[i]->getPerimeter() << endl;
    }

    return 0;
}

输出结果为：

Rectangle: Width=7.2,Height=3.5  Area=25.2  Perimeter=21.4
Circle: R=2.3  Area=16.619  Perimeter=14.4513
Circle: R=1.5  Area=7.06858  Perimeter=9.42477
Rectangle: Width=7.2,Height=3.5  Area=25.2  Perimeter=21.4