Part one addresses the introduction to the sections of an ILE RPG program. It also illustrates how to write a simple file read/write program by using a procedural approach, as well as how to include comments within your programs as documentation.

By Brian Meyers and Jim Buck

Editor's Note: This article is excerpted from chapter 2 of Programming in ILE RPG, Fifth Edition.

The Sections of an ILE RPG Program

ILE RPG programs consist of four main sections:

• Control options section—provides default options for the program
• Declarations section—identifies and defines the files, variables, and other data items a program is to use
• Main procedure section—details the processes, calculations, and procedures the program is to perform
• Subprocedure section—includes declarations and processes for optional distinct functions (subprocedures) of the RPG program that either the main procedure section or other subprocedures can execute once or many times

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