Gotour: Newtonian square roots in Go

sqrt.go

package main

import (
	"fmt"
	"math"
)

const min_delta = 0.000000000001

func Sqrt(x float64) float64 {
	z := 0.0
	for value := 1.0; math.Abs(value-z) > min_delta; {
		z = value
		value = z - (z*z-x)/(2*z)
	}

	return z
}

func main() {
	fmt.Println(Sqrt(34500000))
	fmt.Println("---")
	fmt.Println(math.Sqrt(34500000))
}