prog.go

package main

import (
	"fmt"
	"math"
)

func Sqrt(x float64) (float64, int) {
	z, l, d := 1.0, 1.0, 1.0
	i := 0
	threshold := math.Pow(10, -15)
	for d > threshold {
		i++
		l = z
		z = z - (math.Pow(z, 2)-x)/(2*z)
		d = math.Abs(l-z)
	}
	return z, i
}

func Test() {
	numbers := []int{1,2,3,4,5,10,55,100,1000, 1024}
	for i := 0; i < len(numbers); i++ {
		var n = float64(numbers[i])
		var experimental, e_i = Sqrt(n)
		var builtin = math.Sqrt(n)
		var diff = builtin - experimental
		fmt.Println(experimental, builtin, diff, e_i)
	}
}

func main() {
	Test()
}