By Jim Martin
Focusing strictly on instructing free-format RPG programming equipment, this e-book can assist programmers wishing to improve their abilities This how-to consultant bargains a concise and thorough advent to the elevated productiveness, greater clarity, and more straightforward application upkeep that includes the free-format sort of programming in RPG IV. even if free-format info comes in IBM manuals, it's not separated from every little thing else, requiring hours of tedious learn to trace down the knowledge wanted. This publication presents every thing you want to recognize to write down RPG IV within the free-format sort. writer Jim Martin not just teaches ideas and syntax, but in addition explains how this contemporary kind of coding has the capability to enhance total programmer productivity—from preliminary improvement via upkeep. He methodically covers the numerous kind concerns, reminiscent of named signs and integrated services, and addresses issues together with enter and output, software movement, facts manipulation, math operations, prototyping, and APIs. This 3rd version is up to date to V7.1 of the IBM i working approach on IBM energy machines. An extra bankruptcy explains the hot free-format H, F, D, and P standards brought via IBM in expertise Refresh 7, and programming examples during the e-book are up-to-date to mirror the recent standards.
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Additional resources for Free-Format RPG IV : The Express Guide to Learning Free Format (3rd Edition)
Many fixed-format operations require this format. It requires a C in position 6, and line comments (denoted by *) start in position 7. Extended Factor 2 came into being with the advent of RPG IV, and IBM has enhanced it over the years. It is really a semi–free-format option that has gained a wide margin of acceptance. This format still has level break and conditional indicator capability, although programmers seldom use these options today. The operation codes that exploit the extended Factor 2 format are limited to CallP, Dou, Dow, Eval, For, If/Elseif, Return (in a subprocedure), and Select/When.
We must also use comments—liberally. The addition of named indicators gives free-format RPG IV programmers the ability to code RPG IV like other modern programming languages. You can still code RPG IV using the original calculation format, nearly the same way the language was coded in the 1960s. Or, you can decide to try this new, free-format approach using some of the style methods suggested in this book. In the next several chapters, I show you how to code common programming requirements in free-format RPG IV.
In the calculations, the %Kds built-in function is used on the Chain, Set, or similar operation. This function has two parameters: the named data structure mentioned above and an optional constant that specifies how many key fields to use from the data structure in the operation. If omitted, the second parameter defaults to all key fields. The second method available is the inline composite argument list, provided on the calculation operation line. You specify fields in a parameter-style list, and, together, these fields comprise the lookup key argument.