Exercise9

package Exercise9;

import java.util.Scanner;

/**
 * @author Marvin Exercise9 - Sum and Average
 *
 *         Read, from standard input a series of integers, one per line, ending
 *         in a sentinel value of 999. The numbers will be in the range 0 to
 *         100. Output on a line Sum: followed by the sum of the series of
 *         integers as shown below. Output on a new line Average: followed by
 *         the mean average of the series of numbers formatted to a precision of
 *         2 decimal places as shown below
 */

public class Exercise9 {

    private final static int SENTINEL_VALUE = 999;

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        boolean finished = false;
        int counter = 0;
        int values = 0;

        System.out.println("Please insert random numbers");

        while (!finished) {
            if (scanner.hasNextInt()) {
                int enteredValue = scanner.nextInt();

                if (enteredValue == Exercise9.SENTINEL_VALUE) {
                    finished = true;
                } else {
                    values += enteredValue;
                    counter++;
                }
            } else {
                scanner.next();
                System.out.println("In this program are only numbers allowed");
            }
        }

        if (counter != 0)
            System.out.printf("Sum: %d \nAverage: %.2f", values, (values / (double) counter));

        scanner.close();
    }
}