C/定义一个长方形Rect类再派生出长方体类Cub.cpp

#include <iostream>
using namespace std;

class Rect {
protected:
	double length;
	double width;
		
public:
	Rect(double l, double w) : length(l), width(w) {}
	
	double area() {
		return length * width;
	}
};

class Cub : public Rect {
private:
	double height;
	
public:
	Cub(double l, double w, double h) : Rect(l, w), height(h) {}
	
	double surfaceArea() {
		return 2 * (area() + length * height + width * height);
	}
	
	double volume() {
		return area() * height;
	}
	
	void print() {
		cout << "length=" << length << "  width=" << width << "  height=" << height << endl;
		cout << "表面积=" << surfaceArea() << "  体积=" << volume() << endl;
	}
};

int main() {
	double l, w, h;
	cout << "输入长方体的长、宽、高：" << endl;
	cin >> l >> w >> h;
	
	Cub cub(l, w, h);
	cub.print();
	
	return 0;
}