In C++ (The circle class) Implement the relational operators (<,<=,==,!=,>,>=) in the Circle class in listing 10.9 to order the Circle objects according to their radii.

10.9 Circle class

#ifndef CIRCLE_H

#define CIRCLE_H

class Circle

{

public:

Circle();

Circle(double);

double getArea() const;

double getRadius() const;

void setRadius(double);

static int getNumberOfObjects();

private:

double radius;

static int numberOfObjects();

};

#endif