EXAMPLE PROGRAM OF RUNTIME POLYMORPHISM USIN CPP

#include<iostream.h>

#include<conio.h>

#include<string.h>

class m

{

protected :

     char tit[50];

     float rs;

public   :

m(char *s,float a)

{

strcpy(tit,s);

rs=a;

}

virtual void display () {}

};

class book: public m

{

int pages;

public :

book (char *s,float a,int p):m(s,a)

{

pages=p;

}

void display();

};

class tape :public m

{

float time;

public :

tape (char *s,float a,float tt):m(s,a)

{

time=tt;

}

void display();

};

void book :: display()

{

cout<<"  Title:"<<tit;

cout<<"  Pages:"<<pages;

cout<<"  Price:"<<rs;

}

void tape:: display()

{

cout<<"\n Title:"<<tit;

cout<<"\n Play time:"<<time<<"mins";

cout<<"\n Price:"<<rs;

}

void main()

{

clrscr;

char*title;

float pr,ti;

int pg;

cout<<"\n Enter book details";

cout<<"\n Title :";

cin>>title;

cout<<"\nPrice :";

cin>>pr;

cout<<"\n Pages:";

cin>>pg;

book book1(title,pr,pg);

cout<<"\n Enter tape details \n";

cout<<"\n Title :" <<title;

cout<<"\n Price :"<<pr;

cout<<"\n Play time(mins) :";

cin>>ti;

tape tape1(title,pr,ti);

m*list[2];

list[0]=&book1;

list[1]=&tape1;

cout<<"\n Media details";

cout<<"\n.........book.........";

list[0]->display();

cout<<"\n........tape.........";

list[1]->display();

getch();

}

OUTPUT:

ENTER  BOOK DETAILS

TITLE: BILTECHNOLOGY

PRICE:180

PAGES:650

ENTER TAPE DETAILS:

TITLE:BILTECHNOLOGY

PRICE:180

PLAY TIME (MINS):120

MEDIA DETAILS:

..............BOOK............

TITLE:BIOTECHNOLOGY    PAGES:650     PRICE:180

...................TAPE..........................

TITLE:BIOTECHNOLOGY

PLAY TIME:120MINS

PRICE:180