const int SENTINEL = -1; int count = 0; int sum = 0; int num; double average;

cout << "Enter a value: (or -1 to quit): " << endl; cin >> num; while (num != SENTINEL) { cout << "Enter a value: (or -1 to quit): " << endl; cin >> num; count++; sum += num; }

average = sum/count;

The code above is part of a working program and has a logic error. Describe it, and indicate how to fix it.

(Remember that only partial code is shown here. The answer is not that this is an incomplete program and that a main function is needed.)