everest% cat item.h
// File: item.h
//
//   We use this file to select which kind of data the tree uses.

#ifndef _item_h
#define _item_h

#include "tokenitem.h"

#endif
everest% 

everest% CC emain.C etree.C tree.C tokenitem.C
emain.C:
etree.C:
tree.C:
tokenitem.C:
everest% 

everest% a.out
temp3:
(( 2 ) + ( 3 )) = 5

root:
((( 2 ) + ( 3 )) * ( 5 )) = 25

Expression tree in postorder:
(((  2) (  3) +) (  5) *)

Expression tree in preorder:
(* (+ (2  ) (3  )) (5  ))
everest%