项目3-对象数组操作长方柱类

#include <iostream>

using namespace std;

class Bulk
{
public:
    double area();
    double volume();
    void get_value();
    void output();
    Bulk(double l=1.0,double w=1.0,double h=1.0);
private:
    double length,width,height;
};
Bulk::Bulk(double l,double w,double h)
{
    length=l;
    width=w;
    height=h;
}
int main()
{
    Bulk b[5]={Bulk(2.3,4.5,6.7),Bulk(1.5,3.4),Bulk(10.5)};
    b[4].get_value();
    //下面分别输出这5个长方柱的体积和表面积
    b[0].output();
    b[1].output();
    b[2].output();
    b[3].output();
    b[4].output();
}
double Bulk::area()
{
    return length*width*2+length*height*2+height*width*2;
}
double Bulk::volume()
{
    return length*width*height;
}
void Bulk::get_value()
{
    cin>>length>>width>>height;
}
void Bulk::output()
{
    cout<<"个长方体的面积和体积分别为：";
    cout<<area()<<"  "<<volume()<<endl;
}