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| Preface | |
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| The Evolution of RPG | |
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| Who Should Read This Book | |
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| Which Version of RPG is Covered | |
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| Names are Important | |
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| Introduction | |
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| Position-Oriented Program Specifications | |
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| A Brief Language | |
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| Specification Types | |
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| RPG Components | |
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| RPG Limitations | |
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| Naming Conventions | |
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| Data Types | |
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| Indicators | |
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| Indicator Usage | |
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| Function Key Attention Identification Byte | |
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| Indicator Classification | |
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| Indicators to Avoid | |
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| Constants and Literal Values | |
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| Operation Code Arguments | |
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| Output Control Values | |
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| Subroutine Return Points | |
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| Directives | |
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| Specification Formats | |
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| Specification Types | |
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| Header (Control) Specification | |
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| File Specification | |
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| Definition Specification | |
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| Input Specification | |
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| Input Specification Summary | |
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| Calculation Specification | |
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| Output Specification | |
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| Procedure Specification | |
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| Editing Numeric Output | |
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| Date Edit Code Control Summary | |
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| Table and Array Specification | |
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| Expressions | |
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| Expressions in RPG | |
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| Natural Expressions | |
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| Built-In Functions | |
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| Built-In Function Syntax | |
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| Built-In Function Syntax Summary | |
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| Operation Codes | |
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| Abbreviations Used Throughout This Chapter | |
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| Operation Code Summary | |
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| Unconditionable Operation Codes | |
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| Date and Time Format Codes | |
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| Date and Time Duration Codes | |
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| Operation Extender Cross-Reference | |
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| RPG IV Operation Code Summary Syntax Diagram Legend | |
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| Operation Code Syntax Diagrams | |
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| Boolean Operation Codes | |
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| Free-Format Operation Codes | |
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| Natural Expression Operation Codes | |
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| Program Status Codes | |
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| File-Status Error Codes | |
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| Nested Code Illustration | |
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| Program Organization | |
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| Source File Location | |
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| Source File Member Contents | |
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| Module Definition | |
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| Scope | |
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| Static and Automatic Storage | |
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| Modern Operation Code Usage | |
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| Optimizing | |
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| Do Loops | |
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| Compare and Branch | |
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| Compare Operation | |
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| Ranges, Lists, and Select/Omit | |
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| RPG IV Style | |
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| Structured Programming | |
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| The Structured Approach | |
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| The If-Then-Else Structure | |
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| The Case Structure | |
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| Inter-Module Communication | |
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| Benefits of Modular Programming | |
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| Common Techniques for Inter-Module Communication | |
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| Prototyped Call | |
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| Data Structures and Prototyped Procedures | |
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| Data Areas | |
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| Procedures | |
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| User-Written Procedures | |
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| Calling a Procedure | |
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| Procedure Definition | |
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| Prototyped Procedure Keywords | |
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| Program Entry Point | |
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| A System Interface for Procedures | |
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| File Processing | |
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| Full-Procedural File Processing | |
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| Physical Files | |
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| Logical Files | |
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| File Access | |
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| Access Path Processing | |
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| Workstation Device File Processing | |
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| Chain (Random File Access) | |
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| Open and Close (Open and Close a File) | |
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| Exfmt (Write Then Read Workstation Device) | |
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| Post (Post Device Specific Information) | |
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| Read (Read a Record from a File) | |
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| Readc (Read Next Changed Subfile Record) | |
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| Update (Update a Record) | |
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| Write (Write a Record) | |
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| Alternate Syntax Options | |
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| Fixed-Format Calculation Specifications | |
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| Enhanced-Format Calculation Specifications | |
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| Free-Format Calculation Specifications | |
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| Compiler Options | |
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| Compiler Choices for RPG IV Programs | |
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| The CRTBNDRPG Command | |
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| Decimal Data Errors | |
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| Decimal Data Overview | |
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| Database File Models | |
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| Zoned Decimal Data | |
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| Packed Decimal Data | |
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| Conditions for Decimal Data Errors | |
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| DDS Date and Time Format Considerations | |
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| Database Date and Time Overview | |
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| Database Date Format and Separator (Edit Character) | |
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| Database Time Format and Separator (Edit Character) | |
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| Special Dates and Times Values | |
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| Source Code Listings | |
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| Zinclude Prototypes | |
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| Day of Week Ordinal | |
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| Day of Week Text | |
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| Return as Uppercase String | |
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| Convert to Uppercase | |
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| Return Length of Input String | |
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| In-Line ILE Procedures | |
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| Additional Source Listings | |
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| Index | |