ch10_2.cpp

Since the field of object oriented programming is probably new to you, you will find that there is a

                             // Chapter 9 - Programming exercise 2
#include <iostream.h>

class vehicle {
   int wheels;
   float weight;
public:
   virtual void message(void) { cout << "Vehicle message\n";}
};


class car : public vehicle {
   int passenger_load;
public:
   void message(void) { cout << "Car message\n";}
};


class truck : public vehicle {
   int passenger_load;
   float payload;
public:
   void message(void) { cout << "Truck message\n";}
   int passengers(void) {return passenger_load;}
};


class boat : public vehicle {
   int passenger_load;
public:
   int passengers(void) {return passenger_load;}
   void message(void) { cout << "Boat message\n";}
};


main()
{
vehicle *unicycle;

   unicycle = new vehicle;
   unicycle->message();
   delete unicycle;

   unicycle = new car;
   unicycle->message();
   delete unicycle;

   unicycle = new truck;
   unicycle->message();
   delete unicycle;

   unicycle = new boat;
   unicycle->message();
   delete unicycle;
}



// Result of execution
//
// Vehicle message
// Car message
// Truck message
// Boat message