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

this should work for any root, 2 - ∞, but you probably don't care:

func root(input: Double, base: Int = 2) -> Double {
    var output = 0.0
    var add = 0.0
    while add < 16.0 {
        while pow(output, base) <= input {
            output += pow(10.0, (-1.0 * add))
        }
        output -= pow(10.0, (-1.0 * add))
        add += 1.0
    }
    return output + 0.0
}