// ave1000.cpp: using arrays to compute an average of up to 1000 integers.
//          Reads integers until end-of-file; no prompt for input.

#include <iostream>
using namespace std;

constexpr int MAX_ITEMS = 1000;

// compute average of an array, returning 0 if the array is empty
float ave(int nums[], int size)
{
  int sum = 0;
  for(int i = 0; i < size; ++i)
    sum += nums[i];
  return size == 0 ? 0.0 : float(sum) / float(size);
}

// read all numbers - this illustrates that arrays are passed by reference
//                    just like Java; this returns the number of items read
int read_numbers(int number_list[], int max_count) {
  int count = 0;
  int input_number;
  cin >> input_number;
  while ( cin && count < MAX_ITEMS )
  {
    number_list[count] = input_number;
    ++count;
    cin >> input_number;
  }
  return count;
}

int main()
{
  int nums[MAX_ITEMS];
  int number_count = read_numbers(nums, MAX_ITEMS);
  if ( number_count == 0 )
    cout << "No average for an empty input." << endl;
  else
    cout << "Average: " << ave(nums, number_count) << endl;
  return 0;
}