The Modern RPG IV Language, 2nd Edition

This is a book that you will turn to again and again as you program in RPG IV. Upon completion, you will understand the foundations of RPG IV including structure, specifications, and opcodes, work with each of the specification formats, integrate RPG with DDS specifications for files and displays, program expressions in assignment, declarative, and compare statements, work with parameters and return values, program using the rich set of built-in functions, process full procedural files sequentially and randomly, and use program and file status codes.

This book also covers the following: working with date, time, and timestamp opcodes, using operation extenders, program both embedded and external subprocedures, and knowing how to export global variables. In addition, you will know how to export global variables, and understand how to optimize RPG programs for performance, control program logic without indicators, program with modular design, use data areas effectively, define a prototyped subprocedure, and have a complete reference to all BIFs and OpCodes in RPG IV.