第五周實驗報告（三）

01.#include <iostream>  02.#include <cmath>  03.  04.using namespace std;  05.class Box  06.{  07.public:  08.    void volume();  09.    void area();  10.    void set();  11.    Box (int h = 18,int w = 20,int len = 36):height(h),width(w),length(len){}  12.private:  13.    double length;  14.    double width;  15.    double height;  16.};  17.int main()  18.{  19.    Box a[5] = {  20.  21.    Box(10,12,15),  22.    Box(15,18,20),  23.    Box(16,20,26),  24.    };  25.  26.    a[4].set();  27.  28.    cout << "the volume of a[0] is: " << endl;  29.    a[0].volume();  30.    cout << "the area of a[0] is: " <<  endl;  31.    a[0].area();  32.  33.    cout << "the volume of a[0] is: " << endl;  34.    a[1].volume();  35.    cout << "the area of a[0] is: " << endl;  36.    a[1].area();  37.  38.    cout << "the volume of a[0] is: " << endl;  39.    a[2].volume();   40.    cout << "the area of a[0] is: " << endl;  41.    a[2].area();  42.  43.    cout << "the volume of a[0] is: " << endl;  44.    a[3].volume();  45.    cout << "the area of a[0] is: " << endl;  46.    a[3].area();  47.  48.    cout << "the volume of a[4] is: " << endl;  49.    a[4].volume();  50.    cout << "the area of a[4] is: " << endl;  51.    a[4].area();  52.  53.    system("pause");  54.  55.    return 0;  56.}  57.  58.void Box::area()  59.{  60.    double ar;  61.  62.    ar=2*(length * height + length * width + height * width);  63.  64.    cout << ar << endl;  65.  66.}  67.  68.void Box::volume()  69.{  70.    double vol;  71.  72.    vol = height * width * length;  73.  74.    cout << vol << endl;  75.}  76.  77.void Box::set()  78.{  79.    cin >> height >> length >> width;  80.}