C34 Answer

/* Puzzle C34 -- rotate every array element one position to the right; */
/*               element 0 gets the original last element. */

void rotateRightArray( int arr[], int size )
{
  int j;
  int lastElt;
  
  lastElt = arr[size-1];
  for ( j=size-1; j>=1; j-- )
      arr[j] = arr[j-1];
      
  arr[0] = lastElt;
}