第五週作業3

#include<iostream>

using namespace std;

class Box
{
public:
	Box(int h =8, int w = 8, int len = 9) : heigth(h), width(w), length(len){};//聲明有默認參數的構造函數，用參數初始化表對數據成員初始化
    int volume();
	int area();
	void input();
private:
	int heigth;
    int width;
    int length;
};

int Box :: volume()
{
	return (heigth * width * length);
}

int Box :: area()
{
	return ((heigth * width + heigth * length + width * length) * 2);
}


void Box :: input()
{
	cout << "請輸入長方柱的長，寬，高：";
	cin >> length >> width >> heigth;
}

int main()
{
	Box a[5] = {
	Box(7, 9, 8),
	Box(12, 13, 21),
	Box(11, 12, 16),
	Box(),
	Box()
	};
	for(int i = 0; i < 4; ++i)
	{
		cout << "第" << i + 1 << "長方柱類的體積是    " << a[i].volume() << endl;
	    cout << "第" << i + 1 << "長方柱類的表面積是  " << a[i].area() << endl << endl;
	}
    a[4].input();
    cout << "第" << i + 1 << "長方柱類的體積是    " << a[i].volume() << endl;
	cout << "第" << i + 1 << "長方柱類的表面積是  " << a[i].area() << endl << endl;

	return 0;

}