Golang Learning notes 5--Arrays Array

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Definition of 1.array

• To define the format of an array:

var a[4]int  //元素自动初始化为零a := [...]int{19:1}  //编译器按照初始化值数量确定数组长度a := [5]int{1,2}  //未提供初始值的元素自动初始化为零

• Array lengths are also part of a type, so arrays with different lengths are of different types

• Array is a value type in Go

2. Array pointers and pointer arrays

//数组指针是指获取数组变量的地址。//此时变量p就是指向数组的指针。特别注意p定义的类型为长度为100的数组的指针。 长度必须相等才能赋值。func main() {    var a =  [...]int{99:1}    var p *[100]int = &a    fmt.Println(p)}  //指针数组是指元素为指针类型的数组func main() {    var x, y = 2, 3    var a  = [...]*int{&x, &y}    fmt.Println(a)}

3. Comparisons between arrays

You can use = = or between arrays! = Compare, but cannot use < or >

//数组类型必须相同才能比较func main() {  a := [2]int{1,2}  b := [2]int{1,3}  fmt.Println(a == b)}

4. Using new to create an array, this method returns an array pointer

func main() {  p := new([10]int)  fmt.Println(p)}

5. Multidimensional arrays

func main() {    a := [2][3]int{        {1,2,3},        {4,5,6}    }    b := [2][3]int{        {1:1},        {2:2}    }    c := [...][3]int{        {1:1},        {2:2}    } }