一、完整代码

package main

import (
	"bufio"
	"fmt"
	"math/rand"
	"os"
	"strconv"
	"strings"
	"time"
)

func main() {
	maxNum := 100
	rand.Seed(time.Now().UnixNano())
	secretNumber := rand.Intn(maxNum)
	//fmt.Println("The secret number is", secretNumber)
	//fmt.Println("The secret number is", secretNumber) 注释掉，要不然用户就直接看到正确答案了

	fmt.Println("Please input your guess")
	reader := bufio.NewReader(os.Stdin)   //只读
	for{
			input, err := reader.ReadString(
) //读取一行输入
			if err != nil {
				fmt.Println("An error occured while reading input. Please try again", err)
			//	return
						continue
			}
			input = strings.TrimSuffix(input, "
") //多了一个换行符，去掉换行符

			guess, err := strconv.Atoi(input) //转换成数字
			if err != nil {
				fmt.Println("Invalid input.Please enter an integer value")
				//return //错误的话 退出进程
						continue
			}
			fmt.Println("You guess is", guess)
			//逻辑判断
			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//猜对即退出
			}
	}
}

二、用fmt.Scanf 来简化代码实现

package main
import (
	"fmt"
	"math/rand"
	"time"
)
func main() {
	maxNum := 100
	rand.Seed(time.Now().UnixNano())
	secretNumber := rand.Intn(maxNum)
	fmt.Println("Please input your guess")
	for{
			var guess int
			_, err := fmt.Scanf("%d", &guess)
			if err != nil {
				fmt.Println("Invalid input.Please enter an integer value")
						continue
			}
			fmt.Println("You guess is", guess)
			//逻辑判断
			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//猜对即退出
			}
	}
}

三、运行结果