gistfile1.go

package main

import (
  "fmt"
  "math"
)

func Sqrt(x float64) float64 {
  z := float64(1)
  last_z := z
  diff := -1.0
  
  for diff == -1.0 || diff > 0.000001 {
	last_z = z
	
	z = z - ((z * z) - x) / (2 * z)
	
	diff = z - last_z
	
	if (diff < 0) { diff *= -1.0 }
  }
  
  return z
}

func main() {
  x := 25.
  fmt.Println("Sqrt()", Sqrt(x))
  fmt.Println("math.Sqrt()", math.Sqrt(x))
}