author：shuaibing.huo@gmail.com

package mainimport ( "fmt" "os")//使用函数实现一个简单的图书管理系统//每本书有书名、作者、价格、上架信息//用户可以在控制台添加书籍、修改书籍信息、打印所有书籍列表//需求分析//0. 定义结构体type book struct{ title string author string price float32 publish bool}//1. 打印菜单func showmenu(){ fmt.Println("欢迎登陆BMS!") fmt.Println("1.添加书籍") fmt.Println("2.修改书籍") fmt.Println("3.展示所有书籍") fmt.Println("4.退出")}func userInput() *book { var ( title string author string price float32 publish bool ) fmt.Println("请根据提示输入相关内容") fmt.Print("请输入书名:") fmt.Scanln(&title) fmt.Print("请输入作者:") fmt.Scanln(&author) fmt.Print("请输入价格:") fmt.Scanln(&price) fmt.Print("请输入是否上架(true|false):") fmt.Scanln(&publish) fmt.Println(title,author,price,publish) book := newbook(title,author,price,publish) return book}//2. 等待用户输入菜单选项//定义一个book指针的切片，用来存储所有书籍var allbooks = make([]*book,0,200)//定义一个创建新书的构造函数func newbook(title,author string, price float32, publish bool) *book{ return &book{ title: title, author: author, price: price, publish: publish, }}//3. 添加书籍的函数func addbook(){ var ( title string author string price float32 publish bool ) fmt.Println("请根据提示输入相关内容") fmt.Print("请输入书名:") fmt.Scanln(&title) fmt.Print("请输入作者:") fmt.Scanln(&author) fmt.Print("请输入价格:") fmt.Scanln(&price) fmt.Print("请输入是否上架(true|false):") fmt.Scanln(&publish) fmt.Println(title,author,price,publish) book := newbook(title,author,price,publish) for _, b := range allbooks{ if b.title == book.title{ fmt.Printf("《%s》这本书已经存在",book.title) return } } allbooks = append(allbooks,book) fmt.Println("添加书籍成功！")}//4. 修改书籍的函数func updatebook(){ book := userInput() for index, b := range allbooks{ if b.title == book.title{ allbooks[index] = book fmt.Printf("书名:《%s》更新成功！",book.title) return } } fmt.Printf("书名:《%s》不存在！", book.title )}//5. 展示书籍的函数func showbook(){ if len(allbooks) == 0 { fmt.Println("啥也么有") } for _, b := range allbooks { fmt.Printf("《%s》作者：%s 价格:%.2f 是否上架销售: %t\n",b.title,b.author,b.price,b.publish) }}//6. 退出 os.Exit(0)func main(){ for { showmenu() var option int fmt.Scanln(&option) switch option { case 1: addbook() case 2: updatebook() case 3: showbook() case 4: os.Exit(0) } }}