go 语言（九）----struct

1. 定义一个结构体

type Book struct {
   
	title string
	auth string
}

2. 结构体使用

package main

import "fmt"

//定义一个结构体
type Book struct {
   
	title string
	auth string
}

func main() {
   

	var book1 Book
	book1.title = "Golang"
	book1.auth = "zhang3"
	
	fmt.Println("%v\n",book1)
}

3. 结构体传参

package main

import "fmt"

//定义一个结构体
type Book struct {
   
	title string
	auth string
}

func changeBook(book Book) {
   
	//传递一个book的副本
	book.auth = "666"
}

func changeBook3(book *Book)  {
   
	//指针传递
	book.auth = "777"

}

func main() {
   

	var book1 Book
	book1.title = "Golang"
	book1.auth = "zhang3"

	fmt.Println("%v\n",book1)

	//副本传递是不会改变结构体的值
	changeBook(book1)
	fmt.Println("副本传递",book1)

	//指针传递
	changeBook3(&book1)
	fmt.Println("指针传递",book1)
}