package main

import (
	"fmt"
)

func main() {
	a := [4]int{1, 2, 3, 4}
	reverse(&a)
	fmt.Println(a)

	// var n *int
	// fmt.Println(*n)
}

func reverse(arr *[4]int) {
	for idx, val := range *arr {
		(*arr)[len(arr)-1-idx] = val
	}
}