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                ### 結構體初始化 ~~~ type Student struct { id int name string age int gender string } func main() { //順序初始化,每個程序必須初始化 var s1 Student = Student{1, "jack", 20, "男"} fmt.Println(s1) //指定成員初始化,沒有初始化的成員為類型的零值 s2 := Student{name: "jack", gender: "男"} fmt.Println(s2) } ~~~ ~~~ {1 jack 20 男} {0 jack 0 男} ~~~ ### 指針變量初始化 ~~~ type Student struct { id int name string age int gender string } func main() { //順序初始化,每個程序必須初始化 var p1 *Student = &Student{1, "jack", 20, "男"} fmt.Println(p1) //指定成員初始化,沒有初始化的成員為類型的零值 p2 := &Student{name: "jack", gender: "男"} fmt.Printf("%T",p2) fmt.Println(*p2) } ~~~ ~~~ &{1 jack 20 男} *main.Student //結構體類型 {0 jack 0 男} ~~~ ### 普通變量 ~~~ type Student struct { id int name string age int gender string } func main() { var s Student s.id = 1 s.name = "jack" //s.age = 20 //s.gender = "男" //未賦值就是零值 fmt.Println(s) } ~~~ ~~~ {1 jack 0 } ~~~ ### 指針變量 ~~~ type Student struct { id int name string age int gender string } func main() { //指針有合法指向后,才能操作成員 //先定義一個普通結構體變量 var s1 Student //定義一個指針變量,保存s的地址 var p1 *Student p1 = &s1 //通過指針操作成員p1.id和(*p1).id完全等價 p1.id = 1 (*p1).name = "jack" fmt.Println(p1) //通過new申請一個結構體 p2 := new(Student) p2.id = 2 p2.name = "milan" fmt.Println(p2) } ~~~ ~~~ &{1 jack 0 } &{2 milan 0 } ~~~
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