1. Define Polymorphism.
2. Give a real world example of the concept of Polymorphism.
3. Explain the difference between virtual and pure virtual.
4. What is the main purpose behind using polymorphism? What does it make
easier while programming in C++?
5. Write 3 or 4  class definitions (header files) to show how
polymorphism works.

6. Consider the following code fragment:

  class DriverHandle {
       int handle;

   public:

       virtual void  sync() = 0;
   };

   Is the above class an abstract class? Why? What type of function is
sync() ?

7.  If we try to define an object of the above DriverHandle class, what
will happen?
   What is the use of this class, if we cannot define an object for it?
   If we derive a class from this object, what will determine if this
derived class
   is abstract or not?

8.  Consider the following classes:

   class NoVirtual {

       int a,b;

   public:

       void func();

   };

   class WithVirtual {
       int a,b;

   public:

      virtual void func();

   };

   Suppose you create an object of each in main. What are the sizes of
   these objects? Are they the same? If not, why?

9.  Consider the following code:

   class Vehicle {

       // ...

    public:

       virtual void start() { cout << "Start vehicle...."; }

       void stop { cout << "Stop the vehicle ...."; }

   };

   class Car {

       // ...

    public:

       void start() { cout << "Hit the road!"; }

       void stop() { cout << "No more gas!"; }

    };

    int main() {

       Car merc;

       Vehicle *v = &merc;

       v->start();

       v->stop();

    }

     What is the expected output for the above piece of code? Why?