public class Circle {
    public double x, y, r;
    public Circle(double x, double y, double r) {
        this.x = x; this.y = y; this.r = r;
    }
    public Circle(double r) { x = 0.0; y = 0.0; this.r = r; }
    public Circle(Circle c) { x = c.x; y = c.y; r = c.r; }
    public Circle() { x = 0.0; y = 0.0; r = 1.0; }
    public double circumference() { return 2 * 3.14159 * r; }
    public double area() { return 3.14159 * r*r; }
}