第五周任务3

#include <iostream>   
using namespace std;  
class Long  
{  
public:  
    Long(); 
	Long(float x,float y,float z):length(x),width(y),heigth(z){};
    void show();  
    void getvalue();  
private:  
    float length;  
    float width;  
    float heigth;  
    float volume ;  
    float surface ;  
};  
int main()  
{  
    int i;  
	Long L[5]={Long(12,10,15),Long(13,14,15),Long(7,8,9)};//前边必须要声明带参数的构造函数才行,否则在这里对数组元素直接初始化将会出错。
	L[4].getvalue();
	for(i=0;i<5;i++)
	{
		L[i].show();
	}
	return 0;  
}


Long::Long() 
{ 
    heigth=10; 
    width=10; 
    length=10; 
} 

void Long::show()  
{  
    cout<<"三边为："<<length<<" "<<width<<" "<<heigth<<endl;  
    volume=length*width*heigth;  
    surface =2*(length*heigth+length*width+width*heigth);  
    cout<<"体积为:"<<volume<<" "<<" 面积为:"<<surface<<endl;  
}  

void Long::getvalue()  
{  
    float x,y,z;
	cout<<"请输入三边: ";
    cin>>x; 
	cin>>y;
	cin>>z;
    length=x;  
    width=y;  
    heigth=z;
}