#include <iostream>
using namespace std;
class base
{
private:
int x;
float y;
public :
virtual void getdata( );
virtual void display( )=0;
};
class derived : public base
{
private:
int roll,m[10],sum,n,no;
char name[20];
float avg;
public :
void getdata( );
void display( );
};
void base :: getdata( )
{
}
void base :: display( )
{
}
void derived :: getdata( )
{
cout<<"\n\nEnter Roll of the Student: ";
cin>> roll;
cout<<" \nEnter Name of the Student: ";
cin>>name;
sum=0;
cout<<"\nEnter Number of Subjects : ";
cin>>n;
for(int i=0; i<n; i++)
{
cout<<"\nEnter Marks in Subject "<<i+1<<": ";
cin>>m[i];
sum+=m[i];
}
avg=sum/n;
}
void derived :: display( )
{
cout<<"\n\n\n";
cout<<"\nRoll No :"<<roll <<endl;
cout<<"\nName :"<<name<<endl;
cout<<"\nAverage :"<<avg<<endl;
}
int main( )
{
cout<<"\n\n **** IMPLEMENTATION OF VIRTUAL AND PURE VIRTUAL FUNCTOIN ****\n";
int no;
base * ptr;
derived obj;
ptr = &obj;
cout<<"\n\n Enter Number of Records :";
cin>>no;
for(int i=0; i<no; i++)
{
cout<<"\n\n\n\n Details of Student "<<i+1<<" :- "<<endl;
cout<<"\n\n\t******* READING DATA ******* \n";
ptr -> getdata( );
cout<<"\n\n\t******* DISPLAYING DATA ******* ";
ptr -> display( );
}
}
OUTPUT
**** IMPLEMENTATION OF VIRTUAL AND PURE VIRTUAL FUNCTOIN **** Enter Number of Records :2 Details of Student 1 :- ******* READING DATA ******* Enter Roll of the Student: 01 Enter Name of the Student: AAA Enter Number of Subjects : 2 Enter Marks in Subject 1: 45 Enter Marks in Subject 2: 78 ******* DISPLAYING DATA ******* Roll No :1 Name :AAA Average :61 Details of Student 2 :- ******* READING DATA ******* Enter Roll of the Student: 02 Enter Name of the Student: BBB Enter Number of Subjects : 2 Enter Marks in Subject 1: 54 Enter Marks in Subject 2: 67 ******* DISPLAYING DATA ******* Roll No :2 Name :BBB Average :60