Tour of Golang #25

tour_golang_25.go

package main

import (
	"fmt"
	"math"
)

func newtonSqrtFormula(z float64, x float64) float64 {
	return (z - (((z * z) - x) / (2 * z)))
}

func Sqrt(x float64) float64 {
	var z float64 = 1
	var i int = 1
	var prev_z float64 = -1
	for ; ; i++ {
		z = newtonSqrtFormula(z, x)
		if math.Abs(z - prev_z) < 0.000000000000001 {
			break
		}
		prev_z = z
	}
	fmt.Println("Iterations:", i)
	return z
}

func main() {
	var x int = 7
	fmt.Println(math.Sqrt(float64(x)))
	fmt.Println(Sqrt(float64(x)))
}