RPG is a programming language for business applications. Originally an initialism for Report Program Generator, it officially no longer stands for anything. Note that while the primary vendor of RPG has been and remains IBM, the language was available from other mainframe and microcomputer manufacturers, including Unisys. The latest incarnation of RPG is RPG IV (ILE RPG) on IBM's System i servers; it inherits the System i Integrated Language Environment’s features such as prototyped functions and procedures, static and dynamic binding, access to C routine libraries, dynamic link libraries, and fully recursive and re-entrant modular code.

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