what is the sentinel value in the following code snippet?
public static void main(String[] args)
{
int age = 0;
int sum_of_ages = 0;
int stop = 1;
Scanner reader = new Scanner(System.in);
System.out.println("Enter an age (-1 to stop): ");
age = reader.nextInt();
while (age != -1)
{
sum_of_ages = sum_of_ages + age;
System.out.println("Enter an age (-1 to stop): ");
age = reader.nextInt();
}
System.out.println("Sum of ages " + sum_of_ages);
return 0;
}
