Playing around with go following the tutorials here: https://tour.golang.org/welcome/3

sqrt_newton_method.go

package main

import (
	"fmt"
)

const INITIAL_Z = 1
const DELTA = 1e-7


// Newton's Method for Sqrt Algorithm
func Sqrt(x float64) float64 {
	var z float64 = INITIAL_Z
	var i int = 0
	
	// infinite loop
	for {
		delta := (z*z - x) / (2 * z)
		z = z - delta
		
		fmt.Printf("%v: %v \t(Delta: %v)\n", i, z, delta)
		i += 1
		
		// absolute delta for comparison with DELTA
		if delta < 0 {
			delta = -delta
		}
  
    		// stopping criterion
		if delta < DELTA {
			fmt.Println("Stopping Criterion Met")
			return z
		}
	}

	return z
}


func main() {
	fmt.Println(Sqrt(64))
}