数组和切片

package main
import "fmt"

func main() {
    var a [3]int     # 定义了一个长度为三的int类型数组
    fmt.Println(a)    # 运行结果：[0,0,0]
-----------------------------------------------------------------
     # 定义并赋值初值 
     var a [6]int = [6]int{1, 2, 3, 4, 5, 6}  # >>>:[1, 2, 3, 4, 5, 6]
     var a = [6]int{1, 2, 3}   # >>>:[1, 2, 3, 0, 0, 0]
     a := [6]int{1, 2, 3}    # >>>:[1, 2, 3, 0, 0, 0]
     a := [...]int{1,2,3}    # 忽略数组的长度，用...来代替，编辑器会自动生成长度。
     a[5] = 100
     fmt.Println(a)
-----------------------------------------------------------------
     # 将第7个位置设置为666
     a := [10]int{1, 2, 5: 666, 6: 777}    # [1 2 0 0 0 666 777 0 0 0]
     a[-7] = 13    # 不支持负索引
}