题目描述

输入描述

输出描述

样例输入

5 4 3

样例输出

5.00 4.00 3.00 60.00

代码填空：

#include<iostream>
#include<iomanip>
using namespace std;
class Box
{
    private:
    double l,w,h;
    public:
    friend ostream& operator<<(ostream& output,Box b1);
    friend istream& operator>>(istream& intput,Box& b1);
};
//pdsu-c1
//pdsu-c1
int main()
{
    Box b1;
    cin>>b1;
    cout<<b1;
    return 0;
}