"Hands-On System Programming with Go" of directory operations

To open a new book, "Hands-On System Programming with Go", look at the system,

This aspect of the East, had previously used C language,

Now with GO, come again! !

package main

import (
	"fmt"
	"os"
	"path/filepath"
)

func main() {
	wd, err := os.Getwd()
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println("starting dir:", wd)

	if err := os.Chdir("d:\\"); err != nil {
		fmt.Println(err)
		return
	}

	if wd, err = os.Getwd(); err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println("final dir:", wd)

	if len(os.Args) != 2 {
		fmt.Println("Please specify a path.")
		return
	}

	root, err := filepath.Abs(os.Args[1])
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println("listing files in ", root)
	var c struct {
		files int
		dirs  int
	}

	filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
		if info.IsDir() {
			c.dirs++
		} else {
			c.files++
		}
		fmt.Println("-", path)
		return nil
	})

	fmt.Printf("Total: %d files in %d directiories.", c.files, c.dirs)

}