virtual2.cpp

含有文章和源码

                                  // Chapter 10 - Program 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:
   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;
car sedan;
truck semi;
boat sailboat;

   unicycle.message();
   sedan.message();
   semi.message();
   sailboat.message();
// unicycle = sedan;
}



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