void Swap(int & numA, int & numB)
// This function takes two integer variables
//  ('numA', 'numB') and interchanges (swaps) them.
{
   int temp;  // Temporary variable used during swap
   temp = numA;
   numA = numB;
   numB = temp;
}


void BubbleSort(apvector<int> & list)
// This function uses a Bubble Sort to sort an array
//  ('list') of integers in non-decreasing order.
{
   for (int i=0; i<list.length(); i++)
      for (int j=0; j<list.length()-1-i; j++)
         if (list[j] > list[j+1])
            Swap(list[j], list[j+1]);
}