// A sample class
object Newton extends App {

  def EPS = 1e-5

  def sqrt(x: Double): Double = {
    def loop(y: Double): Double = 
      if (math.abs(y * y - x) > EPS) loop(((x / y) + y) / 2.0)
      else y

    loop(1.0)
  }

  println(sqrt(2.0)) // 1.41
}