// Vehicle class definition

  class Vehicle  
  {
    public:   

      // prototypes for member functions (methods)

      // compute and return range 
      int range();       

      // declare constructor and destructor 
      Vehicle(int num_passengers, int gal_fuel_capacity, int miles_gallon);
      ~Vehicle();
         
      // data members (attributes)
      int passengers;     // number of passengers in vehicle
      int fuel_capacity;  // fuel tank capacity in gallons
      int mpg;            // miles per gallon
  };