gistfile1.go

package main

import (
    "fmt"
    "math"
)

func Sqrt10(x float64) float64 {
    var z float64 = x
    
    for i := 0; i < 10; i++ {
	    z = calc(z, x)
    }
    return z
}

func SqrtDiff(x float64) float64 {
    var prev float64 = x
    var z float64 = calc(x, x)
    
    for (prev - z) < 0.000001 {
	    z = calc(z, x)
    }
    return z    
}

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

func main() {
    fmt.Println(math.Sqrt(2))
    fmt.Println(Sqrt10(2))
    fmt.Println(SqrtDiff(2))
  
}