package main

import "fmt"

func main()  { var arr1 [] int //初始化 arr2 := [3]int {1,2,5} //编译器来确定个数 arr3 := [...]int {2,3,4,6,7} //二位数组 var grid[4][5] int fmt.Println(arr1) fmt.Println(arr2) fmt.Println(arr3) fmt.Println(grid) //数组遍历方法1 fmt.Println("..........arr3:",arr3) for i:=0 ; i<len(arr3);i++{ fmt.Println(arr3[i]) } //数组遍历方法2 fmt.Println("..........arr3:",arr3) for i,v := range arr3 { fmt.Println(i, v) } //数组遍历方法3，省略变量 fmt.Println("..........arr3:",arr3) for _,v := range arr3 { fmt.Println(v) } //数组遍历方法3，省略变量 fmt.Println("..........arr3:",arr3) for _,v := range arr3 { fmt.Println(v) }

}

s := arr[2:6]
s = s[:3]
s = s[1:]

fmt.Printf("s3=%v, len(s3)=%d, cap(s3)=%d",s3,len(s3),cap(s3))

package main

import ( "fmt"
)

func printSlice(s [] int)  { fmt.Printf("%v, len=%d,cap=%d\n",s, len(s),cap(s))
}
func main() { //创建slcie var s [] int //Zero value for slice is nil for i:=0 ; i<100 ; i++  { printSlice(s) s = append(s, 2 * i + 1) } fmt.Println(s) s1 := [] int {2,4,6,8} printSlice(s1) //使用内置函数创建slice s2 := make([]int ,16) s3 := make([]int ,16,20) printSlice(s2) printSlice(s3) fmt.Println("copy slice") //  slice拷贝 copy(s2,s1) fmt.Println(s2) fmt.Println("delete element from slice ") //删除掉第三个元素 s2 = append(s2[:3] ,s2[4:]...) printSlice(s2) //从头删除 font := s2[0] s2 = s2[1:] fmt.Println("font=",font) printSlice(s2) //从尾巴删除 tail := s2[len(s2)-1] s2 = s2[:len(s2)-1] fmt.Println("tail=",tail) printSlice(s2) }