n vnmvcn

#include<iostream>
using namespace std;

class box {
 public:
    int width, height, lenght;
    void calculatevolume() {
         cout << "volume is : " << width * lenght * height ;
    }



};
int main () {

    box b1,b2;

    b1.width=10;
    b1.height=5;
    b1.lenght=2;

    b2.width=5;
    b2.height=10;
    b2.lenght=1;


    b1.calculatevolume();
    b2.calculatevolume();

    return 0 ;
}