01: #include <iostream>
02: using namespace std;
03: 
04: int main()
05: {  double sum = 0;
06:    int count = 0;
07:    double salary = 0;
08:    while (salary != -1)
09:    {  cout << "Enter a salary, -1 to finish: ";
10:       cin >> salary;
11:       if (salary != -1) 
12:       {  sum = sum + salary;
13:          count++;
14:       }
15:    }
16:    if (count > 0)
17:       cout << "Average salary: " << sum / count << "\n";
18:    return 0;
19: }