Overloaded Operators Exercise

#include <iostream>
#include <math.h>  // for sqrt()

using namespace std;

#define PI  3.14159

class Circle{
public:
    Circle() : m_Radius( 0.0), m_Area( 0.0) { };
    Circle(double r) : m_Radius( r), m_Area( PI*r*r) { };

    // Based on the last digit of your M-Number write the following overloaded operator:
    // 1) +   add areas together, calculate radius [= sqrt(area/PI)]
    // 2) -   subtract area of other circle's area from this, calculate radius
    // 3) >   test if this  circle's area is >  other  circle's area
    // 4) <=  test if other circle's area is >= this   circle's area
    // 5) ==  test is this  circle's area == the other circle's area
    // 6) <<  print out something informative about this circle
    // 7) >>  read in a radius 
    // 8) ++  Postfix increment the radius by 1.0 (and update the area)
    // 9) ++  Prefix  increment the radius by 1.0 (and update the area)
    // 0) Choose one from above :) 
    
private:
    double m_Radius;
    double m_Area;
};


int main(){
    Circle largeCir( 33.3), smallCir( 2.2), resultCir;

    resultCir = largeCir + smallCir;
    cout << largeCir << " + " << smallCir << " = " << resultCir <<  endl;
    
    resultCir = largeCir - smallCir;
    cout << largeCir << " - " << smallCir << " = " << resultCir <<  endl;

    cout << largeCir << " >  " << smallCir << ": " << (largeCir >  smallCir) << endl;
    cout << largeCir << " >= " << smallCir << ": " << (largeCir >= smallCir) << endl;
    cout << largeCir << " <  " << smallCir << ": " << (largeCir <  smallCir) << endl;
    cout << largeCir << " <= " << smallCir << ": " << (largeCir <= smallCir) << endl;
    cout << largeCir << " == " << smallCir << ": " << (largeCir == smallCir) << endl;

    cout << "Enter the radius of a new circle: ";
    cin >> resultCir;
    cout << "resultCir: " << resultCir << endl;

    cout << "++" << largeCir << " = ";
    resultCir = ++largeCir;
    cout << resultCir << endl;
    
    cout << smallCir << "++ = ";
    resultCir = smallCir++;
    cout << resultCir << endl;

    return 0;
}