Page 222 - DCAP404 _Object Oriented Programming

Unit 10: Virtual Functions and Polymorphism

cout<< “Three \n”; } Notes

};
void main ( ) {
//define three objects
baseA obja;
derivedB objb;

derivedC objc;
base A *ptr [3]; //define an array of pointers to baseA
ptr [0] = &obja;
ptr [1] = &objb;
ptr [2] = &objc;
for (int i = 0; i <=2; i ++ )
ptr [i]->display (); //same message for all objects

getche ( );
}
Output
One
Two
Three

The program listed below illustrates the static binding of the member functions of a class. In
program there are two classes student and academic. The class academic is derived from class
student. The two member function getdata and display are defined for both the classes. *obj is
defined for class student, the address of which is stored in the object of the class academic.

Notes The functions getdata ( ) and display ( ) of student class are invoked by the pointer
to the class.
# include <iostream.h>
#include <conio.h>
class student {
private:

int rollno;
char name [20];
public:
void getdata ( );
void display ( );
};

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