MAIN

public static void problem_2() {
        /*
          Write a Java program that would ask the user to enter five numbers.
        As the user enters the five numbers the program will make sure that
        all the numbers entered by the user are unique. For example, if the
        user enters 2, 3, 4, 6, and then tries to enter 3 again the program
        will display that 3 is already among the entered numbers and would
        ask the user to enter a new number. You will have to keep taking
        numbers from the user until you receive five unique numbers. At the
        end, print those five unique numbers.
         */
        Scanner tuna = new Scanner(System.in);
        int n, i, j;
        int[] arr = new int[5];
        //number = tuna.nextInt();
        System.out.println("Enter 5 numbers:");

        for (i = 0; i < 5; i++) {
            arr[i] = tuna.nextInt();
            n = arr[i];

            for (j = 0; j <= i - 1; j++) {
                if (arr[j] == n) {
                    System.out.println(n + " is already among the entered numbers. Enter a new number");
                    i--;
                }
            }

        }

        for (i = 0; i < 5; i++) {
            System.out.print(arr[i] + " ");
        }

    }