随机数

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maxNum := 100
fmt.Println("Create a random number")
//rand.Seed(time.Now().UnixNano())
random := rand.Intn(maxNum)
fmt.Println(random)

不用设立种子也能生成随机数。

用户输入输出

猜随机数小游戏

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func main() {
	maxNum := 100
	secretNumber := rand.Intn(maxNum)
	// fmt.Println("The secret number is ", secretNumber)

	fmt.Println("Please input your guess")
	reader := bufio.NewReader(os.Stdin)
	for {
		input, err := reader.ReadString('\n')
		if err != nil {
			fmt.Println("An error occured while reading input. Please try again", err)
			continue
		}
		input = strings.TrimSuffix(input, "\n")
		input = strings.TrimSuffix(input, "\r") // Windows 平台还要加上这一行
		guess, err := strconv.Atoi(input)

		if err != nil {
			fmt.Println("Invalid input. Please enter an integer value")
			continue
		}
		fmt.Println("You guess is", guess)
		if guess > secretNumber {
			fmt.Println("Your guess is bigger than the secret number. Please try again")
		} else if guess < secretNumber {
			fmt.Println("Your guess is smaller than the secret number. Please try again")
		} else {
			fmt.Println("Correct, you Legend!")
			break
		}
	}
}

bufio来控制输入

rand来生成随机数