Learn Rpg4 - 1 Code Examples & CST Typing Practice Test
RPG IV (also called RPGLE or ILE RPG) is IBM’s modern dialect of the RPG programming language used on the IBM i (AS/400) platform. It provides structured, modular, and database-integrated programming capabilities for building business applications, batch processing systems, and enterprise automation on IBM i.
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Learn RPG4 with Real Code Examples
Updated Nov 27, 2025
Learning Path
Learn free-form syntax
Understand files/I/O
Study procedures and prototypes
Master SQL + RPG integration
Implement service programs and modular design
Skill Improvement Plan
Week 1: Basic RPGLE syntax
Week 2: Database operations
Week 3: Procedures and modular code
Week 4: SQL + modern APIs
Week 5: Build service programs and optimization
Interview Questions
Explain the role of activation groups in ILE RPG.
How does RPG integrate with Db2 for i?
Difference between fixed-format and free-form RPG.
Describe how a service program works.
How do you debug an RPG program?
Cheat Sheet
Use /free for modern RPG code
Define procedures in separate modules
Always prototype external calls
Prefer SQL for modern data access
Manage library lists carefully
Books
Programming in RPG IV
ILE RPG Reference
Modern RPG for the Modern Programmer
IBM i Modernization
RPGLE Free-Form Guide
Tutorials
RPGLE free-form basics
File and SQL I/O
Service programs and modules
Building APIs with RPG
Modernizing legacy RPG/400
Official Docs
IBM RPG IV Reference
IBM ILE Concepts Guide
Db2 for i SQL Reference
IBM Technology Refresh documentation
IBM Knowledge Center RPG articles
Community Links
RPG Cafe
Midrange.com
Code for IBM i
COMMON user group
IBM i community Slack
Community Support
RPG Cafe (IBM)
Midrange.com mailing list
Code for IBM i community
LinkedIn RPG groups
Modern RPG developers Slack
Frequently Asked Questions about Rpg4
What is Rpg4?
RPG IV (also called RPGLE or ILE RPG) is IBM’s modern dialect of the RPG programming language used on the IBM i (AS/400) platform. It provides structured, modular, and database-integrated programming capabilities for building business applications, batch processing systems, and enterprise automation on IBM i.
What are the primary use cases for Rpg4?
CRUD operations on Db2 for i. Batch processing and scheduled jobs. Business logic for ERP systems. APIs and web service backends. Data transformation and ETL workflows
What are the strengths of Rpg4?
Extremely stable and reliable on IBM i. Fast transactional performance. Deep integration with system APIs. Backward compatibility across decades. Strong support for enterprise batch workflows
What are the limitations of Rpg4?
Niche language with limited talent pool. Legacy syntax still common in older systems. Platform-specific (IBM i only). Limited modern UI capabilities. Steep learning curve for non-IBM developers
How can I practice Rpg4 typing speed?
CodeSpeedTest offers 1+ real Rpg4 code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.