Using the C run-time library functions and setting up the prototypes for C functions is an easy way to use features available in the C language.

Written by Jim Martin

Note: This article is an excerpt from the book Functions in Free-Format RPG IV, published by MC Press.

Most RPG programmers don't know the C programming language and avoid technical articles or discussions that have anything to do with it. Until 1993, so did I. That year, I took some college classes in which C was the only language that could be used for assignments. I found that C was very different from RPG, but writing my own functions was very appealing. When I returned to an RPG environment in 1994, I assumed that I would not see any C programming again. In late 1994, however, IBM introduced RPG IV and ILE. At that point, integrating C functions with RPG IV programs became a possibility.

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