Function average

Examples/Modules/Chapter 10/Ex10_04.cpp:25–31

template <typename T, size_t N>
T average(const T(&array)[N])
{
  T sum{};                            // Accumulate total in here
  for (size_t i{}; i < N; ++i)
    sum += array[i];                   // Sum array elements
  return sum / N;                      // Return average
}