'init'

main/defers.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+)
+
+func t() error {
+	a := 10
+	b := 5
+	if b == 0 {
+
+		return errors.New("除数不能为零")
+
+	} else {
+		res := a / b
+		fmt.Println(res)
+
+		return nil
+	}
+}
+func main() {
+	err := t()
+	if err != nil {
+		fmt.Println("自定义错误")
+		//停止后面程序继续执行
+		panic(err)
+	}
+	fmt.Println("继续执行")
+
+	var scores [5]int
+	scores[0] = 10
+	scores[1] = 10
+	scores[2] = 30
+	scores[3] = 40
+	for i := 0; i < len(scores); i++ {
+		fmt.Println(scores[i])
+		fmt.Scanln(&scores[i])
+	}
+	//索引用key接收 value用于里面的值
+	for key, value := range scores {
+		fmt.Println(key, value)
+
+	}
+}

main/der.go

@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+func main() {
+	var book Book
+	book.auth = "1u1"
+	book.name = "aihda"
+	changebook(&book)
+	fmt.Println(book)
+
+}
+func changebook(book *Book) {
+	book.auth = "77"
+}
+
+type Book struct {
+	name string
+	auth string
+}

main/p1.go

@@ -0,0 +1,34 @@
+package main
+
+import "fmt"
+
+type Student struct {
+	Name string
+}
+
+// 函数
+func mthod(s Student) {
+	fmt.Println(s.Name)
+}
+
+func mthod1(s *Student) {
+	fmt.Println((*s).Name)
+}
+func (s *Student) test02() {
+	fmt.Println(s.Name)
+}
+func main() {
+	var stu = Student{"笑傲"}
+	mthod(stu)
+	mthod1(&stu)
+	(&stu).test02()
+	var s = Student{
+		Name: "xio",
+	}
+	fmt.Println(s)
+	var s3 *student = &student{
+		age: 19,
+	}
+	fmt.Println(s3)
+
+}

main/pg.go

@@ -0,0 +1,26 @@
+package main
+
+import "fmt"
+
+func main() {
+	var a [7]int = [7]int{4, 5, 6, 6, 4, 7, 7}
+	var slice []int = a[2:4]
+	fmt.Println(len(slice))
+	slice2 := append(slice, 55, 55)
+	fmt.Println(slice2)
+	fmt.Println(len(slice2))
+	//默认分配10个空间
+	var ip map[int]string
+	//key不能重复,前面会替换后面那个 value 可以重复
+	ip = make(map[int]string, 10)
+	ip[103883] = "张三"
+	ip[173718] = "李四"
+
+	ip[173718] = "李"
+	fmt.Println(ip)
+	//查找
+	value, flag := ip[103883]
+	fmt.Println(value)
+	fmt.Println(flag)
+	fmt.Println(len(ip))
+}

main/pp.go

@@ -0,0 +1,22 @@
+package main
+
+import "fmt"
+
+func main() {
+	tes()
+
+}
+
+func tes() int {
+	//利用defer+recover来捕获错误：defer加匿名函数调用
+	defer func() {
+		err := recover()
+		if err != nil {
+			fmt.Println("错误已经捕获")
+			fmt.Println(err)
+		}
+	}()
+	num02 := 10
+	num01 := 0
+	return num02 / num01
+}

main/project.go

@@ -0,0 +1,22 @@
+package main
+
+import "fmt" //导入别的包 先执行别的包里面 再执行自己包里面
+
+//做变量初始化
+
+// 后是 init函数 全局变量再执行，main函数调用
+
+var num int = test()
+
+func test() int {
+	fmt.Println("test")
+	return 10
+}
+func init() {
+	fmt.Println("1")
+
+}
+func main() {
+	fmt.Println("2")
+
+}

main/pt.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	//创建对象实例
+	var T teacher = teacher{}
+	T.Name = "dakjda"
+	fmt.Println(T)
+	//使用指针创建对象
+	var t *teacher = new(teacher)
+	(*t).school = "没用"
+	(*t).age = 19
+	fmt.Println(t)
+	var s student
+	var p person
+	s = student(p)
+	fmt.Println(s)
+}
+
+// 定义结构体 方便内存管理
+type teacher struct {
+	Name   string
+	age    int64
+	school string
+}
+
+type student struct {
+	age int
+}
+type person struct {
+	age int
+}

main/pu.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	//定义切片：make函数的三个参数：1.切片类型。2.切片的长度
+	slice := make([]int, 4, 20)
+	fmt.Println(slice)
+	fmt.Println(len(slice))
+	fmt.Println(cap(slice))
+	slice[0] = 66
+	slice[1] = 88
+	slice1 := []int{3, 4, 5}
+	fmt.Println(slice1)
+	//按照数组的方式操作
+	for key, value := range slice1 {
+		fmt.Println(key, value)
+	}
+}