//
// Program to compute average of a sequence of grades
// (Version 2)
//
// Input:  sequence of non-negative integers (grades),
//   terminated by a end of file (control-D).
// 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 control-D 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();
  while (cin >> temp)		// read input and test for end of
				// file, all in one fell swoop
    {
      ++count;
      total += temp;
      promptForNext();
    }

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