go语言渐入佳境[15]-struct声明与定义-创新互联

//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)
}