Virtual function another exa. in oop

#include<iostream.h>
#include<conio.h>

class parent
{
    public:
        virtual void show()=0;      //IF THERE R 2 PURE VIRTUAL FUNCTIONS THEN THE CHILD CLASSES MUST HAVE BOTH THE VIRTUAL FUNCTIONS OVERRIDDED.
      virtual void show1()=0;    

   };

class child1:public parent
{
    public:
        void show()
    {
    cout<<"child1 class:    ";
    }

   void show1()
   {
   cout<<"child1:    ";
   }
   };

class child2:public parent
{
    public:
        void show()
    {
    cout<<"child2 class:    ";
    }
   void show1()
   {
   cout<<"child2:    ";
   }

   };

        void main()
{
    parent * ptr[2];
    ptr[0]=new child1;
    ptr[1]=new child2;
    ptr[0]->show();
   ptr[0]->show1();

    ptr[1]->show();
   ptr[1]->show1();
    getch();
}vi