Gotour Loops and Functions

gistfile1.go

package main

import (
	"fmt"
	"math"
)

func NewtonSqrt(x float64, z float64) float64 {
	return z - ((math.Pow(z, 2.0) - x) / (2 * z))
}

func Sqrt(x float64, diff float64) float64 {
	k := 1.0
	guess := NewtonSqrt(x, k)
	
	for {
		next := NewtonSqrt(x, guess)
		
		if math.Abs(next - guess) <= diff {
			break
		} else {
			guess = next
		}
		
	}
	
	return guess
}

func main() {
	fmt.Println("Newton's Method:", Sqrt(9, 0.00001), "GO Method:", math.Sqrt(9))
	fmt.Println("Newton's Method:", Sqrt(144, 0.00001), "GO Method:", math.Sqrt(144))
	fmt.Println("Newton's Method:", Sqrt(12, 0.00001), "GO Method:", math.Sqrt(12))
}