exercise-stringer.go

package main

import (
	"fmt"
)

type IPAddr [4]byte

func (ip IPAddr) String() string {
	str := ""

	for i := 0; i < len(ip); i++ {
		str += fmt.Sprintf("%d.", ip[i])
	}

	return str[:len(str) - 1]
}

func main() {
	hosts := map[string]IPAddr{
		"loopback":  {127, 0, 0, 1},
		"googleDNS": {8, 8, 8, 8},
		"simple": {1, 2, 3, 4},
	}
	for name, ip := range hosts {
		fmt.Printf("%v: %v\n", name, ip)
	}
}