golang Sqrt

sqrt.go

package main

import (
    "fmt"
    "math"
)

func Sqrt(x float64) float64 {
    z := float64(1)
    const count = 10
    for i := 0; i < count ; i++ {
	    z = z - (math.Pow(z,2) - x) / (2 * z) 
    }
    return z
}

func Sqrt2(x float64) float64 {
    z := float64(1)
    y := sqrtiter(x,z)
    const diff = 0.000000000000001
    for math.Abs(z-y) > diff {
     	z = y
        y = sqrtiter(x,z)
    }
    return y
}

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

func main() {
    fmt.Println(Sqrt(2))
    fmt.Println(Sqrt2(2))

}