object vezbe
{
//    1 abs(1*1-x)<1e-4
//   (1+x/1) / 2
    def abs (x: Double):Double = if (x < 0) -x else x

    def sqrtIter(guess: Double, x: Double): Double =
        if(isGoodEnough(guess,x)) guess
        else sqrtIter(improve(guess,x),x)

    def isGoodEnough(guess:Double, x: Double) =
        abs(guess * guess - x) < 1e-5

    def improve(guess: Double, x: Double) = 
        (guess + x/guess)/2
    
    def sqrt(x:Double) = sqrtIter(1,x)

    def main (args:Array[String]):Unit={
        println("Koren od 2 je " + sqrt(2))
        println("Koren od 25 je " + sqrt(25))
    }
}