Go: Newton's method for square root (using recursion)

golang_squareroot.go

package main

import (
	"fmt"
)

var z = 100.0 // the seed
var delta = 0.0001 // the epsilon

func Sqrt(x float64) float64 {	
	z = z - (z*z - x) / (2 * z)
	if z*z-x < delta {
		return z
	}
	fmt.Println("value of z = %f", z)
	return Sqrt(x)
}

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

Use Printf
fmt.Printf("value of z = %f\n", z)
By the way, great solution! 👍