Scala Learning: Finding Square Root
I am renewing my learning in Scala and I have started the course Functional Programming Principles in Scala in Coursera. Here is some code which is taken from that course object SqrtCalculator extends App{ def abs(x: Double): Double = if(x < 0) - x else x def sqrt (x: Double) : Double = { def sqrtIterator(guess: Double): Double = if (isGoodEnough(guess)) guess else sqrtIterator(improve(guess)) def isGoodEnough(guess: Double): Boolean = abs(guess * guess - x) / x < 0.0001 def improve(guess: Double): Double = (guess + x / guess) / 2 sqrtIterator(1.0) } println(sqrt(2)) println(sqrt(3)) println(sqrt(4)) println(sqrt(1e60)) } Output: 1.4142156862745097 1.7320508100147274 2.0000000929222947 1.0000000031080746E30 Process finished with exit code 0