Lo Gozo con la precisión

package main

import (
	"fmt"
	"math"
)

func Sqrt(x float64) float64 {
	
	z := 1.0
	for i := 0; i < 10; i++ {
		z -= (math.Pow(z, 2) - x) / (2 * z)
	} 
	return z
}

func main() {
	for i := 0.0; i < 10; i++ {
		if v := Sqrt(i) - math.Sqrt(i); v < 0.001{
			fmt.Println("Lo gozo")
		}
	} 
}

Testing Go with Newton method to calculate the Square root:
https://en.wikipedia.org/wiki/Methods_of_computing_square_roots

for the problem:
https://tour.golang.org/flowcontrol/8