go 结构体 注意点:go和c一样,所有的运算都应该在函数内进行

package main

import (
	"fmt"
)

type User struct {
	Username string
	Sex string
	Age int	
	int
	string
}


type Address struct {
	Province string
	City string
}


type User1 struct {
	Username string
	Sex string
	Address
}


type person struct {
	name string
	age int
}


var P person
var P2 = person{"annie",20}
/*go和c一样,所有的运算都应该在函数内进行,函数外进行的是语法错误.
函数体外初始化结构体就两个办法,要么一次性全部赋值,要么先声明(全局/局部)变量,
在某个函数内进行赋值,在函数体外进行结构体成员赋值相当于函数外面进行运算了.

var user User
user.Username = "user01"
user.Age =18
user.Sex ="男"
user.int =100
user.string = "hello"
*/

func main(){
	var user User  // 变量名不能和包名相同,否则会冲突了
	user.Username = "user01"
	user.Age = 18
	user.Sex = "男"
	user.int = 100
	user.string = "hello"
	fmt.Printf("user=%#v\n",user)

	P.name="a"
	P.age=10
	fmt.Printf("001 The person's name is %s \n", P.name)
	fmt.Printf("002 The person2's name is %s \n", P2.name)


	var user1 User1 
	user1.Username = "user1"
	user1.Sex = "男"
	// 第一种方式
	user1.Address = Address{
		Province:"北京",
		City:"北京",
	}
	// 第二种方式
	/*user1.Province = "湖北"
	user1.City = "黄冈"*/
	fmt.Printf("user=%#v addr=%#v\n",user1,user1.Address)
	fmt.Printf("user=%#v province=%v, city=%s\n",user1,user1.Province,user1.City)
}

输出:

user=main.User{Username:"user01", Sex:"男", Age:18, int:100, string:"hello"}
001 The person's name is a
002 The person2's name is annie
user=main.User1{Username:"user1", Sex:"男", Address:main.Address{Province:"北京", City:"北京"}} addr=main.Address{Province:"北京", City:"北京"}
user=main.User1{Username:"user1", Sex:"男", Address:main.Address{Province:"北京", City:"北京"}} province=北京, city=北京