【愚公系列】2022年07月 Go教学课程 026-结构体

type 结构体名 struct {
	
	成员名 数据类型
	...................
}

package main

import "fmt"
// 成员名称前面不能添加var.
type Student struct {
	id   int
	name string
	age  int
	addr string
}
func main() {
	var s Student = Student{101, "愚公", 18, "福建"}
	fmt.Println(s)
	// 部分初始化
	var s1 Student = Student{name: "愚公", age: 18}
	fmt.Println(s1)

	var stu Student
	stu.id = 102
	stu.name = "愚公"
	stu.age = 28
	stu.addr = "南平"
	fmt.Println(stu)
}

package main

import "fmt"

type Student struct {
	id   int
	name string
	age  int
	addr string
}

func main() {
	var arr [3]Student = [3]Student{
		Student{101, "1号", 18, "北京"},
		Student{102, "2号", 18, "北京"},
		Student{103, "3号", 19, "北京"},
	}

	fmt.Println(arr)

	fmt.Println(arr[0])
	fmt.Println(arr[0].age)
	arr[0].age = 20
	fmt.Println(arr)

	// 通过循环来输出结构体数组中的内容。
	for i := 0; i < len(arr); i++ {
		fmt.Println(arr[i].age)
	}

	for k, v := range arr {
		fmt.Println(k)
		fmt.Println(v.age)
	}

}

package main

import "fmt"

type Student struct {
	id   int
	name string
	age  int
	addr string
}

func main() {

	var s []Student = []Student{
		Student{101, "张三", 18, "北京"},
		Student{102, "李四", 18, "北京"},
	}

	fmt.Println(s[0])
	fmt.Println(s[0].age)
	s[0].age = 20
	fmt.Println(s)

	// 循环遍历
	for i := 0; i < len(s); i++ {
		fmt.Println(s[i].name)
	}
	for k, v := range s {
		fmt.Println(k)
		fmt.Println(v.id)

	}

	// 追加数据
	s = append(s, Student{103, "王五", 20, "北京"})
	fmt.Println(s)
}

package main

import "fmt"

type Student struct {
	id   int
	name string
	age  int
	addr string
}

func main() {
	m := make(map[int]Student)
	m[1] = Student{101, "张三", 18, "北京"}
	m[2] = Student{102, "李四", 18, "北京"}
	fmt.Println(m)
	fmt.Println(m[1])
	fmt.Println(m[1].name)

	delete(m, 2)
	fmt.Println(m)
	for key, value := range m {
		fmt.Println(key)
		fmt.Println(value.age)
	}

}