This program reads a sequence of positive integers input by the user, and it will print out the average of those integers.

 This program reads a sequence of positive integers input by the user, and it will print out the average of those integers.  The user is prompted to enter one integer at a time.  The user must enter a 0 to mark the end of the data.  (The zero is not counted as part of the data to be averaged.)  The program does not check whether the user's input is positive, so it will actually add up both positive and negative input values.

import java.util.Scanner;
public class BSIT
{
    public static void main(String[] args)
    {
        Scanner readme = new Scanner(System.in);

        int inputnum;   // for user input container
        int sum;           // The sum of the positive integers.
        int count;         // count The number of positive integers.
        double average;    // The average of the positive integers.

        /* Initialize the summation and counting variables. */

        sum = 0;
        count = 0;

        /* Read and process the user's input. */

        System.out.print("Enter your first positive integer: ");
        inputnum = readme.nextInt();

        while (inputnum != 0) // user input is not 0
        {
            sum += inputnum;   // Add inputNumber to running sum.
            count++;              // Count the input by adding 1 to count.

            System.out.print("Enter your next positive integer, or 0 to end: ");
            inputnum = readme.nextInt();
        }

        /* Display the result. */

        if (count == 0) // if user enter 0 immediately
        {
            System.out.println("You didn't enter any data!");
        }
        else
        {
            average = ((double)sum) / count;
            System.out.println();
            System.out.println("You entered " + count + " positive integers.");
            System.out.printf("Their average is %1.3f.\n", average);
        }

    }

}