What are virtual functions?

• A virtual function is one which has the same name in the base and sub class with the same number of parameters and return type of parameters.
  A *ptr;// A base class
  A aobj;
  B bobj;
  ptr=&a;
  ptr->display();// display() virtual method , this invokes base class method
  ptr=&b;
  ptr->display();// display() this invokes sub class method
  
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