Page 224 - DCAP404 _Object Oriented Programming
P. 224
Unit 10: Virtual Functions and Polymorphism
output Notes
enter rollno
25
enter name
raghu
the student’s roll number is 25 and name is raghu
Did u know? What is dynamic binding?
You can specify the compiler match a function call with the correct function definition at
run time; this is called dynamic binding.
The program listed below illustrates the dynamic binding of member functions of a class. In this
program there are two classes student and academic. The class academic is derived from student.
Student function has two virtual functions getdata ( ) and display (). The pointer for student class
is defined and object for academic class is created. The pointer is assigned the address of the
object and function of derived class are invoked by pointer to student.
#include <iostream.h>
#include <conio.h>
class student {
private:
introllno;
char name [20];
public:
virtual void getdata ( );
virtual void display ( );
};
class academic: public student {
private :
char stream[10];
public:
void getdata ( );
void display ( );
};
void s_dent:: getdata ( )
{
cout<< “enter rollno\n”;
cin >> rollno;
cout<< “enter name \n”;
cin >>name;
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