package main

import (
	"fmt"
	"math"
)

func myPow(x float64, n int) float64 {
	res , count ,  pow := float64(1) , 1 ,  0
	for n != pow {
		tmp := x
		count = 1
		for pow < n {
			res *= tmp
			if res == 0 {
				return 0
			}
			tmp *= tmp
			pow += count
			count *= 2
		}
		tmp = x
		count = 1
		for pow > n {
			res /= tmp
			tmp *= tmp
			pow -= count
			count *= 2
		}

	}
	return res
}

func main() {
	fmt.Println(myPow(2123,-489))
	fmt.Println(math.Pow(2123,-489))
}