Declare Array in Golang

package main

import (
    "fmt"
)

func main() {
    var a [4]int
    a[0] = 9
    a[1] = -12
    a[2] = 28
    a[3] = 5
    fmt.Println("Length 1: ", len(a))
    fmt.Println(a)

    b := [5]int{7, -2, 9, -8, 20}
    fmt.Println("Length 2: ", len(b))
    fmt.Println(b)

    c := [...]int{2, 4, 6, 8, 10, 200, 300}
    fmt.Println("Length 3: ", len(c))
    fmt.Println(c)
}    

Output

Length 1:  4
[9 -12 28 5]

Length 2:  5
[7 -2 9 -8 20]

Length 3:  7
[2 4 6 8 10 200 300]