/**
  * This program will compute the arithmetic average for a set of non-negative integers .
  * Enter -1 to terminate the program.
  * @author Anthony Larrain
  */


import java.text.DecimalFormat;
import javax.swing.JOptionPane;

public class Average {
	public static void main( String [] args ) {
		int sum = 0, count = 0;
		String numbers = JOptionPane.showInputDialog("Enter Integer  (-1 to quit) ");
		int value = Integer.parseInt(numbers);

		while (value != -1){
			sum += value;
			++count;
		    numbers = JOptionPane.showInputDialog("Enter Integer  (-1 to quit) ");
		    value = Integer.parseInt(numbers);
		}

		if(count != 0){
			double average = sum / (double) count;
			DecimalFormat fmt = new DecimalFormat("0.000");
			System.out.println("The average is :  " + fmt.format(average));
		}else{
			System.out.println("No values entered");
		}

		System.exit(0);
	}
}