Call:
   if (searchList(x,ptr))
      printf("%d is in the list.\n", x);
  else printf("%d is Not in the list.\n",x);

listPointer searchList(int x, listPointer  ptr)
{/* print out the contents of the list */
  listPointer temp = ptr;
  do {
     if (temp->data == x) return temp;
     temp=temp->link;
  } while  (temp != ptr);
  return NULL;
}