package main
import (
	"fmt"
	"strconv"
	"strings"
)

type IPAddr [4]byte

func (ip IPAddr) String() string {
	s := make([]string, len(ip))
	for i, val := range ip {
		s[i] = strconv.Itoa(int(val))
	}
	return strings.Join(s, ".")
}

func main() {
	hosts := map[string]IPAddr{
		"loopback":  {127, 0, 0, 1},
		"googleDNS": {8, 8, 8, 8},
	}
	for name, ip := range hosts {
		fmt.Printf("%v: %v\n", name, ip)
	}
}

func factorial(x uint) uint {
	if x == 0 {
		return 1
	}
	return x * factorial(x-1)
}

func main() {
	var input uint
	input = 1
	for input != 0 {
		fmt.Print("Enter a number: ")
		fmt.Scanf("%d", &input)
		fmt.Println(input, factorial(input))
	}
}

{
   "5": {
   ... neco
   },
   "52": {
   ... neco
   },
   "57": {
   ... neco
   },
}