设计一个CShape基类,由CShape类派生出矩形类CRectangle。再由矩形类CRectangle派生出长方体类CCuboid,设计不属于这些类的Display函数,用来输出CRectangle和CCuboid对象的周长和面积。根据下面的测试程序设计这些

类：

#include <iostream>
using namespace std;

class CShape {
public:
    virtual double GetArea() {
        return 0.0;
    }
    virtual double GetPerimeter() {
        return 0.0;
    }
};

class CRectangle : public CShape {
public:
    CRectangle(double _width, double _height) : width(_width), height(_height) {}
    virtual double GetArea() {
        return width * height;
    }
    virtual double GetPerimeter() {
        return 2 * (width + height);
    }
private:
    double width, height;
};

class CCuboid : public CRectangle {
public:
    CCuboid(double _width, double _height, double _depth) : CRectangle(_width, _height), depth(_depth) {}
    double GetVolume() {
        return GetArea() * depth;
    }
private:
    double depth;
};

void Display(CShape* pShape) {
    if (dynamic_cast<CRectangle*>(pShape)) {
        cout << "Area: " << pShape->GetArea() << endl;
        cout << "Perimeter: " << pShape->GetPerimeter() << endl;
    } else if (dynamic_cast<CCuboid*>(pShape)) {
        cout << "Area: " << pShape->GetArea() << endl;
        cout << "Perimeter: " << pShape->GetPerimeter() << endl;
        cout << "Volume: " << dynamic_cast<CCuboid*>(pShape)->GetVolume() << endl;
    }
}

int main() {
    CRectangle rect(2.0, 3.0);
    CCuboid cuboid(2.0, 3.0, 4.0);
    Display(&rect);
    Display(&cuboid);
    return 0;
}

这段代码实现了一个CShape基类以及由CShape类派生出矩形类CRectangle和长方体类CCuboid。在这个程序中我们设计了一个Display函数，用来输出CRectangle和CCuboid对象的周长、面积和体积。