import java.text.DecimalFormat;
import java.util.Scanner;

public class Average  {
   public static void main (String[ ] args)    {
      int sum = 0, value, count = 0;
      double average;

      Scanner scan = new Scanner (System.in);

      System.out.print ("Enter an integer (0 to quit): ");
      value = scan.nextInt();
 while (value != 0)  // sentinel value of 0 to terminate
    {
         count++;
         sum += value;
         System.out.println ("The sum so far is " + sum);
         System.out.print ("Enter an integer (0 to quit):");
         value = scan.nextInt();
      }
     System.out.println ();

      if (count == 0)
         System.out.println ("No values were entered.");
      else  {
         average = (double)sum / count;
         DecimalFormat fmt = new DecimalFormat ("0.###");
         System.out.println ("The average is " + fmt.format(average));
      }
   }
}
