// This variation of the previous SentinelSum program uses a "forever loop"
// with a break statement to solve a sentinel problem.

import java.util.*;

public class SentinelSum2 {
    public static final int SENTINEL = -1;

    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int sum = 0;
        
        // infinite "forever" loop with break in the middle
        while (true) {
            System.out.print("Enter a number (" + SENTINEL + " to quit): ");
            int number = console.nextInt();
            
            if (number == SENTINEL) {
                break;  // exit the loop
            }
            
            sum += number;
        }
        
        System.out.println("The total was " + sum);
    }
}