Easiest way to find Square Root in Swift?

Question

I have been trying to figure out how to programmatically find a square root of a number in Swift. I am looking for the simplest possible way to accomplish with as little code ne

Answer 1

func sqrt(num:Int)-> Double {
    var x1:Double = (Double(num) * 1.0) / 2; 
    var x2:Double = (x1 + (Double(num) / x1)) / 2; 
    while(abs(x1 - x2) >= 0.0000001){
        x1 = x2; 
        x2 = (x1 + (Double(num) / x1)) / 2;
        }
    return Double(x2);
  }
print(sqrt(num:2))

**output**
1.414


  [1]: https://i.stack.imgur.com/SuLPj.png