# Intermediate COBOL ## Enterprise Programming for the Modern Mainframe --- ### A Comprehensive Guide to Production-Grade COBOL Development --- **First Edition -- 2026** --- *Covering GnuCOBOL 3.x and IBM Enterprise COBOL 6.x* --- Written for programmers who have learned the basics of COBOL and are ready to build the skills that enterprise systems demand. --- **TechLegacy Press** *Bridging the Past and Future of Enterprise Computing* San Francisco -- New York -- London -- Toronto --- Copyright (c) 2026 TechLegacy Press. All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher, except in the case of brief quotations embodied in critical reviews and certain other noncommercial uses permitted by copyright law. ISBN-13: 978-0-000000-10-9 (Paperback) ISBN-13: 978-0-000000-11-6 (Hardcover) ISBN-13: 978-0-000000-12-3 (eBook) Library of Congress Control Number: 2026XXXXXX **Trademarks** COBOL is a standard programming language maintained by the ISO/IEC JTC 1/SC 22 committee. IBM, z/OS, CICS, DB2, IMS, and Enterprise COBOL are trademarks of International Business Machines Corporation. GnuCOBOL is free software distributed under the GNU General Public License. All other trademarks are the property of their respective owners. **Technical Reviewers** The content of this book has been reviewed by active COBOL professionals with combined experience exceeding 120 years in enterprise COBOL development, spanning banking, insurance, government, and healthcare systems. First printing, 2026 10 9 8 7 6 5 4 3 2 1