import java.util.*;

public class Circle
{   
    // class constant 
    public static final double PI = 3.14159;
    
    // class variable
    private static int circlesCreated = 0;
    
    // instance variables
    private int radius;
    
    // return # of circles created
    public static int getCirclesCreated()
    {
        return circlesCreated;    
    }
    
    /**
     * Constructor that takes radius as parameter
     */
    public Circle(int newRadius)
    {
        radius = newRadius;
        circlesCreated++;
    }
    
    /**
     * Constructor for objects of class Circle
     */
    public Circle()
    {
        // initialise instance variables
        Scanner keyboard = new Scanner(System.in);
        do {
            System.out.print("Enter radius for this circle: ");
            radius = keyboard.nextInt();
        } while (radius <= 0);
        circlesCreated++;
    }

    /**
     * int getRadius()
     */
    public int getRadius()
    {
        System.out.println("in getRadius(), # circles = " + circlesCreated);
        return radius;
    }
    
    /**
     * setRadius(int)
     */
    public void setRadius(int rad)
    {
        if (rad > 0)
            radius = rad;
    }
    
    // find area
    public double findArea()
    {
        return PI * radius * radius;    
    }
    
    /**
     * int findDiameter()
     * calculates and returns the circle's diameter
     */
    public int findDiameter()
    {
        int diameter = 2 * radius;
        return diameter;
    }
}