//********************************************************************

// File: circle .h

// Definition for the class circle

//********************************************************************

#ifndef CIRCLE_H

#define CIRCLE_H

#include "figure.h"

class circle : public figure // a circle is a figure

{

// Overriding member functions (unique for circles)

public:

// Read a circle

void readFigure ( ) ;

// Compute the area of a circle

void computeArea ( ) ;

// Compute the perimeter of a circle

void computePerim( );

// Display characteristics unique to circle s

void displayFig( );

// Data members (unique to circles) . . .

private:

float radius;

};

#endif // CIRCLE_H

//*********************************************************************

// File: circle.cpp

// Implementation of the class circle

//********************************************************************

#include <iostream>

using namespace std;

#include "circle.h"

const float pi = 3.1415927;

// Read data unique to a circle

void circle::readFigure( )

{ cout << "Enter radius : ";

cin >> radius;

}

// Compute the perimeter (circumference) of a circle

void circle::computePerim( )

{ perimeter = 2.0 * pi * radius;

}

// Compute the area of a circle

void circle:: computeArea ( )

{ area = pi * radius * radius;

}

// Display the characteristics of a circle

void circle::displayFig( )

{

// Display the type of figure and its radius.

cout << "Figure Shape is Circle"<< endl;

cout << "Radius is " << radius << endl;

// Call the corresponding function

// in the base cass to display the commoncharacteristics.

figure::displayFig();

}