Square Root

Given a natural radicand, return its square root.

Visit the square-root exercise on Exercism to read the full instructions and download the exercise files.

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(* Dumb brute force *)
fun squareRoot (r: int) : int =
  let val s = ref 1
  in (while (!s) * (!s) < r do s := (!s) + 1; !s)
  end