Intermediate COBOL

# 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. --- **DataField.Dev** --- Copyright (c) 2026 DataField.Dev. This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0). You are free to share and adapt it, including commercially, as long as you give appropriate credit and license your adaptations under the same terms. **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. **How This Book Was Made** This book was drafted with AI assistance and published by DataField.Dev. Corrections and suggestions from instructors and readers are welcome: https://datafield.dev/about.html