go语言渐入佳境[15]-struct声明与定义

//声明Teacher结构体
type Teacher struct {
	name string
	age  int8
	sex  byte
}

var t1 Teacher
 t1.name = "jonson"
 t1.age = 35
 t1.sex = 1

t2 := Teacher{}
t2.name = "olaya"
t2.age = 30
t2.sex = 1

t3 := Teacher{
  name: "Josh",
  age:  28,
  sex:  1,
}
t3 = Teacher{name: "Josh3", age: 27, sex: 1}

t4 := Teacher{"Ruby", 30, 0}

t5 := new(Teacher)
(*t5).name = "Running"
(*t5).age = 31
(*t5).sex = 0
t5.name = "Running2"
t5.age = 31
t5.sex = 0

addr := struct {
  province, city string
}{"陕西省", "西安市"}

package main

import "fmt"

//定义Teacher结构体
type Teacher struct {
	name string
	age  int8
	sex  byte
}

func main() {
//1、var声明方式实例化结构体，初始化方式为：对象.属性=值
var t1 Teacher
	fmt.Println(t1)
	fmt.Printf("t1:%T , %v , %q \n", t1, t1, t1)
//if t1 == nil {
//	fmt.Println()
//}
	t1.name = "Steven"
	t1.age = 35
	t1.sex = 1
	fmt.Println(t1)
	fmt.Println("-------------------")

//2、变量简短声明格式实例化结构体，初始化方式为：对象.属性=值
	t2 := Teacher{}
	t2.name = "David"
	t2.age = 30
	t2.sex = 1
	fmt.Println(t2)
	fmt.Println("-------------------")

//3、变量简短声明格式实例化结构体，声明时初始化。初始化方式为：属性:值 。属性:值可以同行，也可以换行。（类似map的用法）
	t3 := Teacher{
		name: "Josh",
		age:  28,
		sex:  1,
	}
	t3 = Teacher{name: "Josh3", age: 27, sex: 1}
	fmt.Println(t3)
	fmt.Println("-------------------")

//4、变量简短声明格式实例化结构体，声明时初始化，不写属性名，按属性顺序只写属性值
	t4 := Teacher{"Ruby", 30, 0}
	fmt.Println(t4)
	fmt.Println("-------------------")

//5、创建指针类型的结构体
	t5 := new(Teacher)
	fmt.Printf("t5:%T , %v , %p \n", t5, t5, t5)
//(*t5).name = "Running"
//(*t5).age = 31
//(*t5).sex = 0

//语法简写形式——语法糖
	t5.name = "Running2"
	t5.age = 31
	t5.sex = 0
	fmt.Println(t5)
	fmt.Println("-------------------")
}

package main

import "fmt"

type User struct {
//name string
//sex byte
//age int8
//height float64
//weight float64
string
byte
int8
float64

}

func main() {
//	实例化结构体
	user:= User{"jonson" , 'm' , 35 , 177.5}
	fmt.Println(user)
//如果想依次输出姓名、年龄、身高、性别
	fmt.Printf("姓名：%s \n" , user.string)
	fmt.Printf("身高：%.2f \n" , user.float64)
	fmt.Printf("性别：%c \n" , user.byte)
	fmt.Printf("年龄：%d \n" , user.int8)
}