package main

import "fmt"

type person struct {
	city, name string
	age        int
}

func main() {
	//基本实例化
	var p1 person //没有初始化的结构体，其成员变量都是对应其类型的零值。
	p1.age = 10
	p1.city = "anhui"
	p1.name = "ld"

	//匿名结构体
	var user struct {
		name string
		age  int
	}
	user.age = 10
	user.name = "username"
	fmt.Println(p1, user)

	//创建指针类型结构体
	var p2 = new(person)
	fmt.Printf("p2: %T\n", p2)
	fmt.Printf("p2: %#v\n", p2)

	//取结构体地址的实例化
	p3 := &person{}
	fmt.Printf("p3: %T\n", p3)
	fmt.Printf("p3: %#v\n", p3)
	p3.age = 18 //本质在底层是执行的 (*p3).age = 18
	p3.city = "beijing"
	p3.name = "zhang san"
	fmt.Printf("p3: %#v\n", p3)

	p4 := newPerson("p4", "suzhou", 22)
	fmt.Printf("p4: %#v\n", p4)
}

func newPerson(name, city string, age int) *person {
	return &person{
		city: city,
		name: name,
		age:  age,
	}
}