Class Programming

Write a C++ program to explain virtual function (polymorphism) by creating a base class c_polygon which has virtual function area(). Two classes c_rectangle and c_traingle derived from c_polygon and they have area() to calculate and return the area of rectangle and triangle respectively.

Implementation of the above problem:

#include<iostream.h>

#include<conio.h>

class c_polygon

{

protected:

float a,b;

public:

void get_data()

{

cout<<"\nEnter any two floating values:\n";

cin>>a>>b;

}

virtual float area()

{

return 0;

}

};

class c_rectangle:public c_polygon

{

public:

float area()

{

return (a*b);

}

};

class c_triangle:public c_polygon

{

public:

float area()

{

return (b*a/2);

}

};

void main()

{

clrscr();

c_rectangle r;

c_triangle t;

c_polygon *p;

p=&r;

p->get_data();

cout<<"\nArea of rectangle is "<<p->area();

p=&t;

p->get_data();

cout<<"\nArea of triangle is "<<p->area();

getch();

}

Thanks

Mukesh Rajput