import java.util.Arrays;
import java.util.Scanner;

public class ArrayReverse {

    static int arraySize;

    public static void main(String[] args) {

        int[] array;
        int[] reversedArray;
        boolean validArraySize = false;
        boolean validInteger = false;
        String errorSize = "\nError. Not a valid array size. Please insert an integer number greater than 0.";
        Scanner sc = new Scanner(System.in);

        System.out.println("\nWelcome to the program to reverse an integer array.");

        // The user is prompted to determine the size of the array
        while (!validArraySize) {
            System.out.println("\nPlease insert the size of the array");
            if (sc.hasNextInt()) {
                arraySize = sc.nextInt();
                if (arraySize > 0) {
                    validArraySize = true;
                } else {
                    // The user entered an integer number less or equal to 0.
                    System.out.println(errorSize);
                }
            } else {
                // The user did not enter an integer number.
                System.out.println(errorSize);
            }
        }

        // The array is created with the specified size
        array = new int[arraySize];

        // The user is prompted to enter the value for each position of the array
        for (int i = 0; i < array.length; i++) {
            while (!validInteger) {
                System.out.println("\nPlease insert the value for position " + i + ":");
                if (sc.hasNextInt()) {
                    array[i] = sc.nextInt();
                    validInteger = true;
                } else {
                    System.out.println("\nError. Please insert a valid integer number.");
                }
            }
            validInteger = false;
        }

        sc.close();

        System.out.println("\nThe array you entered is: " + Arrays.toString(array));

        reversedArray = reverseArray(array);

        System.out.println("\nThe reversed array is: " + Arrays.toString(reversedArray));
    }

    /**
     * This method reverses the array specified
     *
     * @param pArray The array to reverse
     * @return The reversed array
     */
    public static int[] reverseArray(int[] pArray) {
        int[] arrayToReturn = new int[arraySize];
        int indexToReverse = arraySize - 1;

        for (int i = 0; i < arrayToReturn.length; i++) {
            arrayToReturn[i] = pArray[indexToReverse];
            indexToReverse--;
        }

        return arrayToReturn;
    }
}