Golang Arrays Array

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Arrays Array

• To define the format of an array: var

package mainimport (    "fmt")func main() {    //数组的长度也是类型的一部分，因此具有不同长度的数组为不同类型    var a [2]int //定义长度为2的int型数组。    var b [1]int //长度为1的int型数组    b = a    fmt.Println(b)//此时编译时不通过的}

• The length of the array is also part of the type, so arrays with different lengths are of different types

package mainimport (    "fmt")func main() {    a := [20]int{19: 1}             //长度为20的int型数组，索引位为19的赋值为1    b := [...]int{0: 1, 1: 2, 2: 3} //3个点代表不定长的数组，它会自己去推算数组的长度    fmt.Println(a)    fmt.Println(b)}

• Note A pointer and pointer array that points to an array

package mainimport (    "fmt")func main() {    x, y := 1, 2    c := [...]*int{&x, &y} //保存的元素是指向int型的指针    a := [...]int{99: 1}    var p *[100]int = &a //指向数组的指针，取的是a的地址    //加*代表这是一个指针    fmt.Println(p)       //打印的结果和a的结果是一样的，只不过前面多了一个取地址的符号 &，这就是指向数组的指针    fmt.Println(c)       //指针数组，存的是x和y的内存地址}

• Array is a value type in Go
• You can use = = or! = to compare between arrays, but you cannot use < or >

package mainimport (    "fmt")func main() {    a := [2]int{1, 2}    b := [1]int{1}    fmt.Println(a != b) //mismatched types [2]int and [1]int    //a和b的长度也必须相同才能进行比较，长度不同代表类型不同，数组的比较也是比较严格的}

• You can use new to create an array, and this method returns a pointer to the array

package mainimport (    "fmt")func main() {    p := new([10]int) //使用new关键字来创建这个数组的话，它返回的就是这个数组的指针    fmt.Println(p)}//结果PS G:\mygo\src\mytest> go run .\myfirst.go&[0 0 0 0 0 0 0 0 0 0]

package mainimport (    "fmt")func main() {    a := [10]int{}    a[1] = 2    fmt.Println(a)    p := new([10]int)    p[1] = 2    fmt.Println(p)}

• Go supports multidimensional arrays

package mainimport (    "fmt")func main() {    a := [...][2]int{        {0: 1},        {1: 2},    }    fmt.Println(a)}

• Bubble sort of Go language

  Package Mainimport ("FMT") func main () {a: = [...] Int{5, 2, 3, 6, 7, 8, 9} fmt. PRINTLN (a) num: = Len (a) for I: = 0; i < num; i++ {for J: = i + 1, j < Num, J + + {if a[i] < A[j] {temp: = A[i] A [i] = a[j] a[j] = temp}}} fmt. Println (A)}