gistfile1.go

// Go-language square root implementation
package main
 
import ("fmt")
 
func Sqrt(x float64) float64 {
    z, precision := 1.0, 2.22e-15
    for {
        z = (z + x/z)/2
        if abs(z*z - x) < precision  {
            return z
        }
    }
}

func abs(x float64) float64 {
  if x < 0 {
	    x = -1.0 * x
	}
	return x
}
 
func main() {
    fmt.Println(Sqrt(2))
}