#include <iostream>
    using namespace std;
    class Box
    {   
        double length;
        double breadth;
        double height;
        public:
        double getVolume(void)
        {  
            return length * breadth * height;
        }
        void setLength( double len )
        {   
            length = len;
        }
        void setBreadth( double bre )
        {   
            breadth = bre;
        }
        void setHeight( double hei )
        {   
            height = hei;
        }
        Box operator+(const Box& b)
        {  
            Box box;
            box.length = this->length + b.length;
            box.breadth = this->breadth + b.breadth;
            box.height = this->height + b.height;
            return box;
        } 
    };
    int main( )
    {  
        Box Box1;
        Box Box2;
        Box Box3;
        double volume = 0.0;
        Box1.setLength(6.0);
        Box1.setBreadth(7.0);
        Box1.setHeight(5.0);
        Box2.setLength(12.0);
        Box2.setBreadth(13.0);
        Box2.setHeight(10.0);
        volume = Box1.getVolume();
        cout << "Volume of Box1 : " << volume <<endl;
        volume = Box2.getVolume();
        cout << "Volume of Box2 : " << volume <<endl;
        Box3 = Box1 + Box2;
        volume = Box3.getVolume();
        cout << "Volume of Box3 : " << volume <<endl;
        return 0;
    }