/* Other forms of recursion */

public class oct26
{

// purpose: return sum of ints in A STARTING at index i:
int sumarray(int[] A, startindex i)
 {  if (i >= A.length) return 0;  // end of array reached
      else 
       return A[i] + sumarray(A,i+1);
 } // end sumarray

// purpose: return cell at position i 
cell cellAt(cell L, int i)
 { if (L == null) return null;
    else if (i == 0) return L;
     else return cellAt(L.tail,i-1);
 }


public static void main(String[] args)
{}

} // end oct26



class cell 
{ 
  int head;
  cell tail;
  public cell(int h, cell t)  { head = h; tail = t; }
}