// Program 1
int main()
{
   float average = (4.0f + 6.0f + 10.0f + 3.0f + 15.0f + 12.0f + 1.0f) / 7.0f;
   std::cout << average << std::endl;
}

// Program 2
template <typename ValueType, class Iterator>
ValueType average(Iterator begin, Iterator end)
{
   ValueType total = 0;
   size_t count = 0;
   for(Iterator iter = begin; iter != end; ++iter)
   {
      total += *iter;
      ++count;
   }
   return total / static_cast<ValueType>(count);
}

int main()
{
   for(unsigned i = 0; i < 50; ++i)
   {
      // Assume we have a function GetNumberSet that fits in here
      std::vector<float> numbers = GetNumberSet(i);
      std::cout << average(numbers.begin(), numbers.end()) << std::endl;
   }
}