ขอร้องคนเก่งc++ ช่วยอธิบายการทำงานของโปรแกรมหน่อยครับ

#include <iostream>

using namespace std;

class Box
{
   public:
      double length;   // Length of a box
      double breadth;  // Breadth of a box
      double height;   // Height of a box
};

int main( )
{
   Box Box1;        // Declare Box1 of type Box
   Box Box2;        // Declare Box2 of type Box
   Box Box3;        // Declare Box3 of type Box
   double volume = 0.0;     // Store the volume of a box here

   // box 1 specification
   Box1.height = 5.0;
   Box1.length = 6.0;
   Box1.breadth = 7.0;

   // box 2 specification
   Box2.height = 10.0;
   Box2.length = 12.0;
   Box2.breadth = 13.0;
    // box 3 specification
   Box3.height = 4.0;
   Box3.length = 6.0;
   Box3.breadth = 7.0;
   // volume of box 1
   volume = Box1.height * Box1.length * Box1.breadth;
   cout << "Volume of Box1 : " << volume <<endl;

   // volume of box 2
   volume = Box2.height * Box2.length * Box2.breadth;
   cout << "Volume of Box2 : " << volume <<endl;
    // volume of box 3
   volume = Box3.height * Box3.length * Box3.breadth;
   cout << "Volume of Box3 : " << volume <<endl;
   return 0;
}