Re: Learning RPG IV advanced techniques

Maria, you might want to consider doing some reading on Structured
Programming which is what ILE is. Here are some suggestions. I have
personally not read these books but they might be of value to you.

ILE RPG is essentially a cleaned up C programming language but C is kind of
a tough language so this one on Pascal might be easier to understand.

https://www.amazon.com/structured-programming-Addison-Wesley-information-processing/dp/0201038935/ref=sr_1_15?dchild=1&keywords=structured+programming&sr=8-15

Same thing using Basic.

https://www.amazon.com/Structured-Programming-Computer-Information-Processing/dp/0201038889/ref=sr_1_23?dchild=1&keywords=structured+programming&sr=8-23

https://www.amazon.com/Structured-Computer-Organization-Andrew-Tanenbaum/dp/0132916525/ref=sr_1_51?dchild=1&keywords=structured+programming&sr=8-51

You might want to take a look at YouTube and see what is available on
Structured Programming.

Anyway, hope this helps.




On Fri, Nov 6, 2020 at 9:26 AM Maria Lucia Stoppa <mlstoppa@xxxxxxxxx>
wrote:

Hi all,

I am almost overwhelmed by all the suggestions and links that have been
posted here, and I want to thank you all. I will probably prepare a list
for future reference as soon as I will be able to take a look at all
of them, especially the unknown ones.

To those who asked: my weaknesses are about modules, procedures and service
programs, procedure interfaces included. I made a few of them, but I can't
easily create new ones that fit differents requirements, thus I think I
miss some critical points, despite all the readings I have done and do,
from both official and specialized sources. Many available courses syllabus
talk about "Introduction to ....(these topics)" which to me doesn't sound
like in-depth.

I worked for companies where primary and secondary files were commonly
used, and others were their use were discouraged. So, I usually adapt to
what was there. At my current position, a new and more modern programming
technique is required to open to web services at least, that's why I think
I need to learn more about the topics I mentioned before.

Lucia


Il giorno ven 6 nov 2020 alle ore 17:26 James H. H. Lampert <
jamesl@xxxxxxxxxxxxxxxxx> ha scritto:

On 11/6/20 3:07 AM, Joep Beckeringh wrote:

I don't think I have used every feature of RPG, but I have used
primary and secondary files, matching records and look-ahead fields.
And no, I am not using them anymore.

I've never even figured out *how* to use a secondary file, and I'm not
entirely sure what "matching records" and "look-ahead fields" are, at
least in an RPG context (then again, a quarter century ago, when I was
interviewed for my present position, I had no idea what a "logical file"
was, at least in an IBM Midrange context; my best guess at the time
corresponded more to a "member").

But when I saw that I could, just by specifying it in a file
declaration, tell a program to "read every record of the file and
execute the main for it," I immediately realized that this was something
I could use a dozen different ways. And when I realized that modern
interactive programs (and some non-interactive ones) typically run in an
event-loop, and I could use The Cycle as an event-loop just by slaving
LR to whatever event(s) signaled that it was "time to quit," I realized
that it had at least one use that was largely untapped.

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