//
// Program to compute average of a sequence of grades
// (Version 1)
//
// Input:  sequence of non-negative integers (grades),
//   terminated by a negative integer.
// Output:  average of grades.
//
#include <iostream.h>
#include <stdlib.h>		// has EXIT_SUCCESS

// Post:  prompt for next number has been printed.
void promptForNext(void)
{
  cout << "Enter next grade, or a negative number to quit:\n";
}

// ---- main program ----

int main(void)
{
  int count = 0;		// how many grades read
  int total = 0;		// running total of grades read

  int temp;			// grade read
  promptForNext();
  cin >> temp;
  while (temp >= 0)
    {
      ++count;
      total += temp;
      promptForNext();
      cin >> temp;
    }

  if (count > 0)
    cout << "Average = " << double(total) / double(count) << endl;
  else
    cout << "No numbers entered!\n";
  
  return 0;
}