[Go语言]我的第五个Go语言程序

Exercise: Stringers

Make the IPAddr type implementfmt.Stringer to print the address as a dotted quad.

For instance, IPAddr{1, 2, 3, 4} should print as "1.2.3.4".

package main

import "fmt"

type IPAddr [4]byte

func (ip IPAddr) String() string {
    return fmt.Sprintf("%v.%v.%v.%v", ip[0], ip[1], ip[2], ip[3])
}

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)
    }
}