“declared and not used” Error

Question

I get this error saying that I\'m not using a variable… but to my noob eyes, it looks like I am:

func Sqrt(x float64) float64 {

    z := float64(x);
         


        

Answer 1

Here is another way to look at the function

func Sqrt(x float64) (z float64) {
    z = x
    for i := 0; i < 10; i++ {
        z = z - (z*z - x)/(2*z);
    }
    return
}