// CSE 142, Autumn 2007, Marty Stepp
//
// This program reads many integers until a particular "sentinel"
// value is reached, then displays the total sum.

import java.util.*;   // for Scanner

public class Sentinel {
    // when we see this value, we'll stop reading numbers
    public static final int SENTINEL = -1;

    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int sum = 0;

        // solution to sentinel problem: read the first number outside the loop
        // (this is another kind of a fencepost solution)
        System.out.print("Enter a number (" + SENTINEL + " to quit): ");
        int number = console.nextInt();
        
        while (number != SENTINEL) {
            sum = sum + number;
            System.out.print("Enter a number (" + SENTINEL + " to quit): ");
            number = console.nextInt();
        }

        System.out.println("The total is " + sum);
    }
}