Golang fmt.Scanln函數代碼示例

func main() {
	var x float32
	var y int
	var ch1, ch2 string
	var name string

	fmt.Println("Enter a character")
	if _, err := fmt.Scanln(&ch1); err != nil {
		fmt.Println("Error:", err)
	}

	fmt.Println("Enter a number")
	if _, err := fmt.Scanln(&y); err != nil {
		fmt.Println("Error:", err)
	}

	fmt.Println("Enter another character")
	if _, err := fmt.Scanln(&ch2); err != nil {
		fmt.Println("Error:", err)
	}

	fmt.Println("Enter a name")
	if _, err := fmt.Scanf("%s", &name); err != nil {
		fmt.Println("Error:", err)
	}

	fmt.Println("Enter a floating point value")
	if _, err := fmt.Scanf("%g", &x); err != nil {
		fmt.Println("Error:", err)
	}

	// Display the values read
	fmt.Printf("ch1\t=\t%s\ny\t=\t%d\nch2\t=\t%s\nName\t=\t%s\nx\t=\t%g\n",
		ch1, y, ch2, name, x)
}

func runLogin(cmd *Command, args []string) {
	if len(args) != 0 {
		cmd.PrintUsage()
		os.Exit(2)
	}

	oldEmail := client.Username
	var email string
	if oldEmail == "" {
		fmt.Printf("Enter email: ")
	} else {
		fmt.Printf("Enter email [%s]: ", oldEmail)
	}
	_, err := fmt.Scanln(&email)
	switch {
	case err != nil && err.Error() != "unexpected newline":
		printFatal(err.Error())
	case email == "" && oldEmail == "":
		printFatal("email is required.")
	case email == "":
		email = oldEmail
	}

	// NOTE: gopass doesn't support multi-byte chars on Windows
	password, err := readPassword("Enter password: ")
	switch {
	case err == nil:
	case err.Error() == "unexpected newline":
		printFatal("password is required.")
	default:
		printFatal(err.Error())
	}

	address, token, err := attemptLogin(email, password, "")
	if err != nil {
		if herror, ok := err.(heroku.Error); ok && herror.Id == "two_factor" {
			// 2FA requested, attempt 2FA login
			var twoFactorCode string
			fmt.Printf("Enter two-factor auth code: ")
			if _, err := fmt.Scanln(&twoFactorCode); err != nil {
				printFatal("reading two-factor auth code: " + err.Error())
			}
			address, token, err = attemptLogin(email, password, twoFactorCode)
			must(err)
		} else {
			must(err)
		}
	}

	nrc, err = hkclient.LoadNetRc()
	if err != nil {
		printFatal("loading netrc: " + err.Error())
	}

	err = nrc.SaveCreds(address, email, token)
	if err != nil {
		printFatal("saving new token: " + err.Error())
	}
	fmt.Println("Logged in.")
}

func loginAction(c *cli.Context) {
	api := getAPI(c)
	var url string
	var version string
	var username string
	var password string
	fmt.Printf("URL: ")
	_, urlErr := fmt.Scanln(&url)
	if urlErr != nil {
		panic(urlErr)
	}
	fmt.Printf("Username: ")
	_, usernameErr := fmt.Scanln(&username)
	if usernameErr != nil {
		panic(usernameErr)
	}
	password, passwordErr := getpass.GetPass()
	if passwordErr != nil {
		panic(passwordErr)
	}
	fmt.Printf("Version (default: 1): ")
	_, verErr := fmt.Scanln(&version)
	if verErr != nil {
		version = "1"
	}
	userData, loginErr := api.Login(url, username, password)
	if loginErr != nil {
		LogMessage("Error logging in.  Please check username/password.", "r")
		os.Exit(1)
	}
	saveConfig(username, userData.ApiKey, url, version, c.GlobalString("config"))
	LogMessage("Login successful", "g")
}

func main() {
	var pin string
	var nickname string
	fmt.Print("Enter game pin: ")
	fmt.Scanln(&pin)
	fmt.Print("Enter nickname: ")
	fmt.Scanln(&nickname)
	fmt.Println("Connecting...")
	conn, err := kahoot.NewConnection(pin)
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(1)
	}
	if err := conn.Register(nickname); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	fmt.Println("Awaiting questions...")
	for {
		if conn.WaitQuestion() != nil {
			fmt.Println("Done question loop:", err)
			os.Exit(1)
		}
		fmt.Print("Got question. Answer: ")
		var number string
		fmt.Scanln(&number)
		parsed, _ := strconv.Atoi(number)
		if err := conn.SendAnswer(parsed); err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
	}
}

func gravatar() {
	var name, email string

	fmt.Println("Please enter your first name")
	fmt.Scanln(&name)

	fmt.Println("Please enter your email")
	fmt.Scanln(&email)

	email = strings.ToLower(email)

	h := md5.New()
	io.WriteString(h, email)
	finalBytes := h.Sum(nil)
	finalString := hex.EncodeToString(finalBytes)

	//generate page
	t, _ := template.New("tpl3").Parse(`
	{{define "Gravatar"}}
		<h1>{{.Name}}</h1>
		<img src="http://www.gravatar.com/avatar/{{.Email}}"/>
	{{end}}
	`)
	out, _ := os.Create("myGravatar.html")
	_ = t.ExecuteTemplate(out, "Gravatar", Person{name, finalString})
}

func main() {
	var len1 float64
	var bre1 float64
	var choice int

	fmt.Println("\n********PERIMETER OF SHAPE************\n Enter 1 for Rectangle\n Enter 2 for Circle")
	fmt.Scanln(&choice)
	switch choice {
	case 1:
		{
			fmt.Println("Enter the length and breadth of rectangle::")
			fmt.Scanln(&len1, &bre1)
			r := rectangle{len: len1, breadth: bre1}
			fmt.Println("Details of the rectangle are:", r)
			s := shape(r)
			fmt.Println("Perimeter of rectangle is ::", s.perimeter())
		}
	case 2:
		{
			var rad float64
			fmt.Println("Enter the radius of the Circle")
			fmt.Scanln(&rad)
			c := circle{radius: rad}
			fmt.Println("Details of circle are:", c)
			s := shape(c)
			s = c
			fmt.Println("The perimeter of circle is", s.perimeter())
		}
	default:
		fmt.Println("Wrong Choice")
	}
}

func main() {
	rows, cols, gen := 0, 0, 0
	var row string
	var board []string
	fmt.Scanf("%d %d", &rows, &cols)
	fmt.Scanln(&row)
	board = add_wall_row(cols+2, board)
	for i := 0; i < rows; i++ {
		fmt.Scanln(&row)
		row = WALL + row + WALL
		board = append(board, row)
	}
	board = add_wall_row(cols+2, board)
	for {
		gen += 1
		fmt.Printf("Generation %d:\n", gen)
		print(board)
		new_board := generation(board)
		if compare_boards(board, new_board) || gen >= MAX_GENS {
			gen += 1
			fmt.Printf("Generation %d:\n", gen)
			print(new_board)
			return
		}
		board = new_board
	}
}

func main() {
	n := 0
	eps := 1e-2
	var a float64
	var b float64
	fmt.Println("a: ")
	fmt.Scanln(&a)
	fmt.Println("b: ")
	fmt.Scanln(&b)

	fmt.Println("n", "a", "b", "m", "|Dx/2|")
	for {
		m := (a + b) / 2.0
		Dx := math.Abs((b - a) / 2.0)
		fmt.Println(n+1, a, b, m, Dx)
		if f(a)*f(m) < 0 {
			b = m
		} else {
			a = m
		}
		n++
		if Dx < eps {
			break
		}
	}
}

func do_singletest(wi wordinfo, date time.Time, nr, total int) {
	input := ""
	question := wi.Word

	fmt.Printf("==============================================\n")
	fmt.Printf("Question %d/%d:\n", nr, total)
	fmt.Printf("\n [[ %s ]]\n", wi.Word)
	fmt.Printf("\n\nPress Enter after you remember the meaning of it:\n")
	fmt.Printf("\n Reference: %d Test success/fail: %d/%d\n",
		wi.Totalfreq, len(wi.Succ_history), len(wi.Fail_history))
	fmt.Scanln(&input)
	fmt.Printf("----------------------------------------------\n")
	fmt.Printf("The maning of %s was:\n%s\n\n",
		question, daum_dict(question))
	fmt.Printf("----------------------------------------------\n")
	fmt.Printf("Were you understanding it well? (Yes/No)\n")
	fmt.Scanln(&input)
	if strings.HasPrefix(strings.ToUpper(input), "Y") {
		wi.Succ_history = append(wi.Succ_history, date)
		fmt.Printf("your feedback, Yes applied\n")
	} else {
		wi.Fail_history = append(wi.Fail_history, date)
		fmt.Printf("your feedback, No applied\n")
	}
	winfos.Wordinfos[wi.Word] = wi
	fmt.Printf("----------------------------------------------\n")
	fmt.Printf("\n\n\n")
}

func main() {
	prime_limit := int(math.Sqrt(float64(sieve_limit)))
	l := gen_primes(prime_limit)
	if verbose {
		log.Println("Generated primes below ", prime_limit)
	}

	var rows int
	fmt.Scanln(&rows)
	if verbose {
		log.Println(rows, " rows to come.")
	}

	for i := 1; i <= rows; i++ {
		if verbose {
			log.Println("Processing line ", i)
		}
		var start, stop int
		fmt.Scanln(&start, &stop)
		if verbose {
			log.Println("Generating primes between ", start, " and ", stop)
		}
		r := range_primes(start, stop, l)

		if verbose {
			log.Println("There are ", len(r), " results.")
		}

		for _, prime := range r {
			fmt.Println(prime)
		}
		fmt.Println("")
	}
}

func main() {
	fmt.Println(runtime.NumGoroutine())
	//runtime.GOMAXPROCS(1)

	//生成隨機種子
	rand.Seed(time.Now().Unix())

	begin := make(chan bool)
	go busy(begin)
	fmt.Println(runtime.NumGoroutine())
	<-begin
	fmt.Println("is fucking!")

	var input string
	fmt.Scanln(&input)

	fmt.Println("done1")

	var name string
	for i := 0; i < 3; i++ {
		name = fmt.Sprintf("go_%02d", i) //生成ID
		//生成隨機等待時間，從0-4秒
		go routine(name, time.Duration(rand.Intn(5))*time.Second)
	}

	fmt.Println(runtime.NumGoroutine())
	//讓主進程停住，不然主進程退了，goroutine也就退了

	fmt.Scanln(&input)
	fmt.Println("done")
	fmt.Println(runtime.NumGoroutine())
}

func main() {
	flag.Parse()

	uid := os.Getuid()
	euid := os.Geteuid()

	if uid != 0 || euid != 0 {
		println("grab-box not started with root privileges. Please run grab-box as root.")
		return
	}

	fmt.Println("Welcome to grab-box\n")

	if archiveFilename == nil || *archiveFilename == "" {
		fmt.Println("What is the username/boxname of the box?")

		var slug string
		if _, err := fmt.Scanln(&slug); err != nil {
			log.Fatal(err)
		}
		fmt.Println("")

		metaUrl := fmt.Sprintf("https://app.wercker.com/api/v2/boxes/%v/*", slug)
		response, err := http.Get(metaUrl)
		if err != nil {
			print("Unable to create response for url: %v", err)
		}
		defer response.Body.Close()

		var metaDoc map[string]interface{}
		decoder := json.NewDecoder(response.Body)
		if err := decoder.Decode(&metaDoc); err != nil {
			print("Unable to decode meta data response: %v", err)
		}

		boxurl := metaDoc["tarballUrl"].(string)
		filename, err := downloadBox(boxurl)
		if err != nil {
			log.Fatal(err)
		}

		archiveFilename = &filename
	}

	if boxName == nil || *boxName == "" {
		fmt.Println("What is the name of the box?\n")

		if _, err := fmt.Scanln(boxName); err != nil {
			log.Fatal(err)
		}
	}

	unpackArchive(*archiveFilename, *boxName)

	fmt.Println("\nFixing lxc config...")
	fixConfig(fmt.Sprintf("/var/lib/lxc/%v/config", *boxName), *boxName)

	fmt.Printf("\n\nFinished! You can execute the following command to start the container:\n\n")
	fmt.Printf("\tsudo lxc-start -n '%v'", *boxName)
}

func main() {
	var pin string
	var nickname string
	var answer string
	fmt.Print("Game pin: ")
	fmt.Scanln(&pin)
	fmt.Print("Nickname: ")
	fmt.Scanln(&nickname)
	fmt.Println("Connecting...")
	conn, err := kahoot.NewConnection(pin)
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(1)
	}
	if err := conn.Register(nickname); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	for {
		fmt.Print("Enter to answer question: ")
		fmt.Scanln(&answer)
		fmt.Print("Answer: ")
		var number string
		fmt.Scanln(&number)
		parsed, _ := strconv.Atoi(number)
		if err := conn.SendAnswer(parsed); err != nil {
			fmt.Println(err)
			os.Exit(1)
		}
	}
}

func main() {
	guesses := 0
	var name string
	var guess int
	rand.Seed(time.Now().Unix())
	randnum := rand.Intn(100)
	randnum += 1
	fmt.Println("Hello! What is your name?")
	fmt.Scanln(&name)
	fmt.Printf("Hello %s\n", name)
	fmt.Println("I'm thinking of a number between 1 and 100 ")
	fmt.Println("What is the number I am thinking of?")

	for {
		fmt.Scanln(&guess)
		guesses++
		if guess < randnum {
			fmt.Println("Your guess was too low, try again.")
		} else if guess > randnum {
			fmt.Println("Your guess was too high, try again.")
		} else {
			fmt.Printf("Congratulations %s! you guessed the number was %d\n", name, randnum)
			break
		}
	}
	fmt.Printf("It took you %d guesses to do this\n", guesses)

}

func cmdResetDatabase() {
	if flagCmdResetDatabase {

		if len(flagConfirmBackup) == 0 {
			fmt.Print("Have you performed a database backup? (YES/NO): ")
			fmt.Scanln(&flagConfirmBackup)
		}

		if flagConfirmBackup != "YES" {
			fmt.Print("ABORTED: You did not answer YES exactly, in all capitals.")
			flushLogAndExit(1)
		}

		var confirm string
		fmt.Printf("Are you sure you want to delete everything?  ALL data will be permanently deleted? (YES/NO): ")
		fmt.Scanln(&confirm)
		if confirm != "YES" {
			fmt.Print("ABORTED: You did not answer YES exactly, in all capitals.")
			flushLogAndExit(1)
		}

		api.Srv.Store.DropAllTables()
		fmt.Print("SUCCESS: Database reset.")
		flushLogAndExit(0)
	}

}