inLL(L,d):
|  Input  linked list L, value d
|  Output true if d in list, false otherwise
|
|  p=L
|  while p≠NULL do
|  |  if p.value=d then   // element found
|  |     return true
|  |  end if
|  |  p=p.next
|  end while
|  return false           // element not in list