// 概述，所谓的结构体就是一个对象哈，但是go中没有z对象，于是就诞生了结构体
type Books struct {
	title string
	author string
	subject string
	book_id int
}
 
// 简单的使用
func initStruct()  {
	fmt.Println(Books{"Go 语言","部门老李","部门部门",6495407})
	// 也可以使用 key => value 格式
	book2 := Books{
			title: "Go 语言",
			author: "www.runoob.com",
			subject: "Go 语言教程",
			book_id: 6495407
		}
 
    fmt.Println(
		book2
	)
    // 下面这样的子也是可以的 创建指针类型结构体 等价于 &book2 &取址运算符 
    // bookObj := new(Book)
    // bookObj.title = "xxx"
 
	// 忽略的字段为 0 或 空
	fmt.Println(Books{title: "Go 语言", author: "www.runoob.com"})
 
	var book1 Books
	
	// 访问结构中的成员  构造体.成员名
	book1.title = "java语言"
	fmt.Println(book1.title)
}

 
// 结构体作为函数的参数
func funcParmasStruct()  {
	var Book1 Books
	Book1.title = "Go 语言"
	Book1.author = "www.runoob.com"
	Book1.subject = "Go 语言教程"
	Book1.book_id = 6495407
 
	printBook(Book1)
}
func printBook( book Books ) {
	fmt.Printf( "Book title : %s\n", book.title)
	fmt.Printf( "Book author : %s\n", book.author)
	fmt.Printf( "Book subject : %s\n", book.subject)
	fmt.Printf( "Book book_id : %d\n", book.book_id)
}

 
// 结构体还可以存指针
func PointerStruct(){
	var Book1 Books        /* 声明 Book1 为 Books 类型 */
	var Book2 Books        /* 声明 Book2 为 Books 类型 */
 
	/* book 1 描述 */
	Book1.title = "Go 语言"
	Book1.author = "www.runoob.com"
	Book1.subject = "Go 语言教程"
	Book1.book_id = 6495407
 
	/* book 2 描述 */
	Book2.title = "Python 教程"
	Book2.author = "www.runoob.com"
	Book2.subject = "Python 语言教程"
	Book2.book_id = 6495700
 
	/* 打印 Book1 信息 */
	printBookStruct(&Book1)  // 指针
 
	/* 打印 Book2 信息 */
	printBookStruct(&Book2)
}
 
func printBookStruct( book *Books ) {
   fmt.Printf( "Book title : %s\n", book.title)
   fmt.Printf( "Book author : %s\n", book.author)
   fmt.Printf( "Book subject : %s\n", book.subject)
   fmt.Printf( "Book book_id : %d\n", book.book_id)
}