/**
 * Matt Kretchmar
 * February 3, 2006
 * PrintAverage3.java
 * This program computes the avereage of integers read from 
 * the user.  It uses a while loop to read in the values.  The
 * user enters numbers until a -1 is entered as a sentinnel
 * to indicate end of input.
 */
import java.util.Scanner;

class PrintAverage3
{
    public static void main (String [] args)
    {
        Scanner keyboard = new Scanner(System.in);
        double average = 0;
        int  input = 0;
        int  i;  //loop control variable

        i = 0; // loop counter initialization
               // but no real loop initialization
        
        while ( input != -1 )           // loop condition
        {
            // loop body
            System.out.println("Enter num" + (i+1) + ": ");
            // loop update
            input = keyboard.nextInt();

            if ( input != -1 )
            {
                average = average + input;
                i++;  // update counter, but not loop update!
            }
        }

        if ( i > 0 )
            average = average / (double)i;
        System.out.println("average of "+i+" numbers = "+average);
    }
}