This book is one of a series of texts written by faculty of the Electrical Engineering and Computer Science Department at the Massachusetts Institute of Technology. It was edited and produced by The MIT Press under a joint production-distribution arrangement with the McGraw-Hill Book Company.

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© 1996 by The Massachusetts Institute of Technology

Second edition

All rights reserved. No part of this book may be reproduced in any form or by any electronic or mechanical means (including photocopying, recording, or information storage and retrieval) without permission in writing from the publisher.

This book was set by the authors using the LATEX typesetting system and was printed and bound in the United States of America.

Library of Congress Cataloging-in-Publication Data

Abelson, Harold
    Structure and interpretation of computer programs / Harold Abelson
and Gerald Jay Sussman, with Julie Sussman. -- 2nd ed.
    p. cm. -- (Electrical engineering and computer science
series)
    Includes bibliographical references and index.
    ISBN 0-262-01153-0 (MIT Press hardcover)
    ISBN 0-262-51087-1 (MIT Press paperback)
    ISBN 0-07-000484-6 (McGraw-Hill hardcover)
    1. Electronic digital computers -- Programming. 2. LISP (Computer
program language) I. Sussman, Gerald Jay. II. Sussman, Julie.
III. Title. IV. Series: MIT electrical engineering and computer
science series.
QA76.6.A255         1996
005.13'3 -- dc20              96-17756

Fourth printing, 1999