09-Go语言的指针和结构体

指针的声明

func main() {
	a := 10
	var p1 *int
	p1 = &a
	//指针保存的地址
	fmt.Println(p1)
	//指针本身的地址
	fmt.Println(&p1)
	//指针指向保存的数据
	fmt.Println(*p1)
	//通过指针，修改a的变量
	*p1 = 100
	fmt.Println(a)
	var p2 **int
	p2 = &p1
	//p1的地址
	fmt.Println(p2)
	//p2的地址
	fmt.Println(&p2)
	fmt.Println(**p2)
}

数组指针

        (*p3)[0] = 100
	fmt.Println(arr)
	p3[0] = 200
	fmt.Println(arr)
	fmt.Println("===========================")

	b := 2
	c := 3
	d := 4
	arr2 := [3]*int{&b, &c, &d}
	b = 888
	for i := 0; i < len(arr2); i++ {
		fmt.Println(*arr2[i])
	}

结构体

	var person1 Person
	//初始化默认所有字段的0值
	fmt.Println(person1)
	person2 := Person{}
	person2.age = 20
	person2.name = "Wayne"
	//注意结尾有逗号
	person3 := Person{
		name: "wayne",
		age:  20,
	}
	fmt.Println(person3)
	person4 := Person{name: "Wayne"}
	fmt.Println(person4)
	//注意需要填写所有字段
	person5 := Person{"Wayne", 20}
	fmt.Println(person5)
        person1 = person2
	person1.age = 100
	fmt.Println(person2)

type Person struct {
	name string
	age  int
}

注意结构体是值类型

结构体字段提升

注意，需要是匿名字段

func main() {
        student := Student{}
	student.school = "BD"
	student.name = "wang er gou"
	student.age = 16
	fmt.Println(student)
}

type Person struct {
	name string
	age  int
}
type Student struct {
	Person
	school string
}