20220616@聊天机器人

结合之前的学习，本节来编写一个聊天机器人的雏形，下面的代码中展示了一个简单的聊天程序。

```go
// 非常low的聊天机器人
// 要不是这么菜，也不会写这么垃圾的聊天机器人

package main

import (
	"bufio"
	"fmt"
	"os"
	"strings"
)

func main()  {

//使用标准输入获取用户输入信息
	readInput := bufio.NewReader(os.Stdin)

//打印输入提示
	fmt.Println("Please input a name what you want to call: ")

//使用标准输入获取用户名信息,使用\n作为输入终止符
	inp,err := readInput.ReadString('\n')

if err != nil {
		fmt.Println(err)

} else {
		name := inp[:len(inp)-2]

fmt.Println("Your username is：",name)
		fmt.Printf("Hi,%s,What can I do for you?\n" +
			"please writting anything what you want to do\n",name)
	}

tryMindAgain:
		//等待用户输入
		readMind,err := readInput.ReadString('\n')

if err != nil {
		//打印错误并退出
		goto stdErrFmt
	} else {

//删除最后的换行符号'\n'
		readMind = readMind[:len(readMind)-2]
		//将所有大写字母转为小写
		lowReadMind := strings.ToLower(readMind)

switch lowReadMind {
		case "":
			//输入为空时，跳转到tryMindAgain继续输入
			goto tryMindAgain

case "hi","hello":
			fmt.Println("Hi,I'm your chat assistant, nice to meet you！")

case "bye","see you","nothing":
			fmt.Println("Have a good nice day,bye!")

default:
			fmt.Println("Oops,I have no idea what you say,so sad...")
		}
	}

// 手动返回, 避免执行进入标签
	return

stdErrFmt:
	fmt.Println("输入输出错误，请查看详细日志：")
	fmt.Println(err)
	os.Exit(1)

}
```

打印结果
```
Please input a name what you want to call:
nathan
Your username is： nathan
Hi,nathan,What can I do for you?
please writting anything what you want to do
see you
Have a good nice day,bye!
```