Learn Rpg-iv-as400 - 10 Code Examples & CST Typing Practice Test
RPG IV (also known as RPGLE) is a high-level programming language for IBM i (AS/400) systems, designed for business applications, supporting structured programming, modern free-form syntax, and integration with DB2 databases.
Learn RPG-IV-AS400 with Real Code Examples
Updated Nov 27, 2025
Explain
RPG IV is widely used for enterprise business logic on IBM i systems.
Supports both fixed-format and free-form coding styles.
Integrates seamlessly with DB2 for IBM i database operations.
Used for transaction processing, reporting, and business applications.
Evolved from older RPG III to modernized syntax with modularization and service programs.
Core Features
RPG IV compiler for IBM i
Modularization through procedures and service programs
Embedded SQL for DB2 integration
Structured exception handling
Integration with CL programs and IBM i utilities
Basic Concepts Overview
Program - compiled RPG object on IBM i
Procedure - modular function within RPG IV
Service Program - reusable compiled library of procedures
File - physical or logical DB2 object for data storage
Data Structure - composite variable for complex data handling
Project Structure
Source physical files for RPG IV code
Modules or procedures grouped in service programs
DB2 files for data input/output
CL programs for batch execution or job control
Libraries and object directories for deployment
Building Workflow
Analyze business requirement or transaction logic
Design program structure with procedures or modules
Write RPG IV code (fixed or free-form syntax)
Compile and test program using IBM i development tools
Deploy program to production library and integrate with workflows
Difficulty Use Cases
Beginner: simple data reading/writing programs
Intermediate: modular procedures with DB2 queries
Advanced: batch processing with complex business logic
Expert: service programs and multi-module applications
Architect: enterprise-level transaction systems with IBM i integration
Comparisons
RPG IV vs RPG III: Free-form syntax and modularization
RPG IV vs COBOL on IBM i: RPG optimized for business apps, COBOL more general-purpose
Service programs vs modules: Reusable vs program-specific
RPG IV vs modern languages: Less flexible outside IBM i ecosystem
RPG IV vs CL: CL is for job control, RPG IV for business logic
Versioning Timeline
1960s - RPG I introduced for punched card business applications
1970s - RPG II enhanced for IBM System/34
1980s - RPG III introduced for System/38 and AS/400
1994 - RPG IV (RPGLE) with free-form syntax released
2000s - Embedded SQL and service programs supported
2025 - Modern RPG IV free-form fully integrated with IBM i and DB2 enhancements
Glossary
RPG IV / RPGLE - high-level programming language for IBM i
Procedure - reusable function in RPG IV
Service Program - library of procedures
DB2 - IBM i relational database
CL Program - control language for batch and job management
Frequently Asked Questions about Rpg-iv-as400
What is Rpg-iv-as400?
RPG IV (also known as RPGLE) is a high-level programming language for IBM i (AS/400) systems, designed for business applications, supporting structured programming, modern free-form syntax, and integration with DB2 databases.
What are the primary use cases for Rpg-iv-as400?
Developing core business applications on IBM i. Transaction processing and batch jobs. Integration with DB2 databases. Generating reports and financial calculations. Maintaining legacy ERP and order processing systems
What are the strengths of Rpg-iv-as400?
Optimized for IBM i platform performance. Seamless database access with DB2. Reliable and mature for enterprise-critical applications. Supports modular and maintainable code practices. Large existing ecosystem of legacy business applications
What are the limitations of Rpg-iv-as400?
Primarily limited to IBM i / AS/400 systems. Less popular outside legacy enterprise environments. Modern GUI/web development requires additional tools. Complex for developers unfamiliar with IBM i. Debugging and deployment require IBM i expertise
How can I practice Rpg-iv-as400 typing speed?
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