on-to-c++-seg-541

#include <iostream>
using namespace std;

const double pi = 3.14159;

class box {
  public: double height, width, length;
    // Default constructor:
    box ( ) { }
    // Argument-bearing constructor:
    box (double h, double w, double l) {
      height = h; width = w; length = l;
    }
    // Volume member function:
    double volume ( ) {return height * width * length;}
};

// ...Cylinder definition goes here
class cylinder {
  public: double radius, length;
  // Default constructor:
  cylinder ( ) { }
  // Other member functions
  // Argument-bearing constructor:
  double volume ( ) {return pi * radius * radius * length;}
  };

class railroad_car {
  public: railroad_car ( ) { }
          virtual char* short_name ( ) {return "rrc";}
          virtual double capacity ( ) {return 0.0;}
};

class box_car : public railroad_car, public box {
  public: box_car ( ) : box (10.5, 9.5, 40.0) { }
          virtual char* short_name ( ) {return "box";}
          virtual double capacity ( ) {return volume ( );}
};

// Tank car definition goes here
class tank_car : public railroad_car, public cylinder {
  public: tank_car ( ) : cylinder (3.5, 40.0) { }
  virtual char* short_name ( ) {return "tnk";}
  virtual double capacity ( ) {return volume ( );}
  };

//..Engine &
class engine : public railroad_car {
  public: engine ( ) { }
  virtual char* short_name ( ) {return "eng";}
};

// ..Caboose definition goes here
class caboose : public railroad_car {
  public: caboose ( ) { }
  virtual char* short_name ( ) {return "cab";}
  };

// Define railroad car pointer array:
railroad_car *train[100];

// Declare enumeration constants, needed in switch statement:
enum {eng_code, box_code, tnk_code, cab_code};

main ( ) {
  int n, car_count, type_code;
  for (car_count = 0; cin >> type_code; ++car_count)
    switch (type_code) {
      case eng_code: train[car_count] = new engine;   break;
      case box_code: train[car_count] = new box_car;  break;
      case tnk_code: train[car_count] = new tank_car; break;
      case cab_code: train[car_count] = new caboose;  break;
    }

//Display report.
  for (n = 0; n < car_count; ++n)

// Display shortname & capacity & terminate the line:
cout << train[n] -> short_name ( )
     << "     "
     << train[n] -> capacity ( )
     << endl;

}