class Point {
  double x;  
  double y;  
  Point(double x, double y) {
    this.x = x;
    this.y = y;
  }
  String report() {
    return "(" + this.x + ", " + this.y + ")";
  }
}

class One {
  public static void main(String[] args) {
    Point a = new Point(1.2, 0.6);
    System.out.println(a.report());
    Point b = new Point(-2.3, 5.1);
    System.out.println(b.report());
    System.out.println(One.distance(a, b));
  }
  public static double distance(Point a, Point b) {
    double dx = a.x - b.x;
    double dy = a.y - b.y;
    return Math.sqrt(dx * dx + dy * dy);
  }
}