Scanner s = new Scanner (System.in);

        int[] array = new int [5];

        for (int i=0; i<array.length; i++ ) {
            System.out.printf("Number %d = ", i+1);
            int currentNum = s.nextInt();
            array[i] = currentNum;
        }

           if (args[0].equals("a")) {
               System.out.printf("Result = %d\n", calculateAddition(array));
           } else {
               System.out.printf("Result = %d\n", calculateMultiplication(array));
           }}

         public static int calculateAddition(int[] array) {
            int sum = 0;
            for (int i=0;i<array.length;i++) {
                sum += array[i];
            }
            return sum;
        }

         public static int calculateMultiplication(int[] array) {
            int result = 1;
            for (int i=0;i<array.length;i++) {
                result *= array[i];
            }
            return result;
    }

}