AIM
A program to demonstrate how a pure virtual function is defined, declared and invoked from the object of derived class through the pointer of the base class.
ALGORITHM
1. Start the process
2. Invoke the class with pointer
3. Assign ptr<-&obj
4. Call the ptr->getdata()
a. Get the roll no and name of the student
5. Call the ptr->display()
a. Print the roll no and name
6. Stop the process
PROGRAM
#include<iostream.h> #include<conio.h> class base { private: int x; float y; public : virtual void getdata( ); virtual void display( ); }; class dev : public base { private: int roll; char name[20]; public : void getdata( ); void display( ); }; void base :: getdata( ) { } void base :: display( ) { } void dev :: getdata( ) { cout<<” Enter Roll of the Student “; cin>> roll; cout<<” Enter name of the student”; cin>>name; } void dev :: display( ) { cout<<”Name is :”<<name<<endl; cout<<” Roll no is :”<<roll <<endl; } void main( ) { base * ptr; dev obj; clrscr( ); ptr = &obj; ptr -> getdata( ); ptr -> display( ); getch( ); } |
OUTPUT
Enter the roll no of the student: 111
Enter the name of the student : Kapil Dev
Name is : Kapil Dev
Roll no is : 111
