A3book.cpp

#include<iostream>

using namespace std;

class publication
{
	public:
		char title[20];
		float price;

		virtual void read()
		{
			cout<<"\nEnter the title:";
			cin>>title;
			cout<<"\nEnter the price:";
			cin>>price;
		}

		virtual void show()
		{
			cout<<"Title:"<<title<<endl;
			cout<<"Price:"<<price<<endl;
		}

};

class book:public publication
{
	public:	
		int page_count;

		void read()
		{
			cout<<"\nEnter the no of pages:";
			cin>>page_count;
		}

		void show()
		{
			cout<<"Page Count of book:"<<page_count<<endl;
		}
};

class tape:public publication
{
	public:	
		float playtime;

		void read()
		{
			cout<<"\nEnter the time in minutes:";
			cin>>playtime;
		}

		void show()
		{
			cout<<"Playing time in tape:"<<playtime<<endl;
		}
};

int main()
{
	publication *ptr;
	publication obj;
	book b;
	tape t;

	obj.read();
	obj.show();

	ptr=&b;
	ptr->read();
	ptr->show();

	ptr=&t;
	ptr->read();
	ptr->show();
	
	return 0;
}