Assume that all variables in the following code are properly declared and that the input is 3 7 4 -1. The output is 13.
num = console.nextInt();
sum = num;
while (num != -1)
{
num = console.nextInt();
sum = sum + num;
}System.out.println(sum);

The code reads in integer inputs until it encounters -1 and adds each input to a running total stored in the variable sum. In this case, the input values are 3, 7, 4, and -1, so the sum should be 3+7+4 = 13, which is exactly what is printed out by the final System.out.println statement. Therefore, the answer is A.