#include <iostream.h> 
const double pi = 3.14159;
class tank_car {
  public:
    double radius, length;
    // Default constructor:                      ///
    tank_car ( ) {radius = 3.5; length = 40.0;}  ///
    // Volume function:
    double volume ( ) {return pi * radius * radius * length;}
};
main ( ) {
  tank_car t;
  cout << "The volume of the tank car is " << t.volume ( ) << endl;
}