class Reverse {

    /*
     * This program demonstrates how to reverse the content of an array
     * in-place using a constant amount of temporary memory.
     */
    public static void main(String[] args) {

        int [] a = { 2, 3, 1, 8, 4, 5, 8 };

        for (int i = 0; i < a.length; i++)
            System.out.print(a[i] + " ");
        System.out.println();

        for (int i = 0, j = a.length-i-1; i < j; i++, j--) {
            int t = a[i];
            a[i] = a[j];
            a[j] = t;
        }

        for (int k = 0; k < a.length; k++)
            System.out.print(a[k] + " ");
        System.out.println();
    }

}