抽象类Shape类，派生了Circle类和Rectangle类，请阅读主函数代码，完成Shape类、Circle类、Rectangle类的定义 【样例输入】 无 【样例输出】 Rectangle: Width=3.5,Height=7.2 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=3.5,Height=7.2 Area=25.2 Perimeter=21.4

好的，以下是Shape类、Circle类和Rectangle类的定义：

#include <iostream>
#include <cmath>

using namespace std;

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

class Circle : public Shape {
private:
    double r;
public:
    Circle(double r) : r(r) {}
    double area() { return M_PI * r * r; }
    double perimeter() { return 2 * M_PI * r; }
};

class Rectangle : public Shape {
private:
    double width, height;
public:
    Rectangle(double width, double height) : width(width), height(height) {}
    double area() { return width * height; }
    double perimeter() { return 2 * (width + height); }
};

主函数代码如下：

int main() {
    Rectangle r(3.5, 7.2);
    cout << "Rectangle: Width=" << r.getWidth() << ",Height=" << r.getHeight() 
         << "  Area=" << r.area() << " Perimeter=" << r.perimeter() << endl;

    Circle c1(2.3);
    cout << "Circle: R=" << c1.getR() << "  Area=" << c1.area() 
         << " Perimeter=" << c1.perimeter() << endl;

    Circle c2(1.5);
    cout << "Circle: R=" << c2.getR() << "  Area=" << c2.area() 
         << " Perimeter=" << c2.perimeter() << endl;

    Rectangle r2(3.5, 7.2);
    cout << "Rectangle: Width=" << r2.getWidth() << ",Height=" << r2.getHeight() 
         << "  Area=" << r2.area() << " Perimeter=" << r2.perimeter() << endl;

    return 0;
}

输出结果为：

Rectangle: Width=3.5,Height=7.2  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=3.5,Height=7.2  Area=25.2 Perimeter=21.4