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Developer> RPG
How Flexible are Your Calculations?RPG programming techniques to help you solve unsolvable problems.
September 2007 | by Jon Parisand Susan Gantner
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Constraining the Problem Space
We mentioned constraining the problem space. Simply put, with problems of this nature, its easy to say, RPG can't do that. And in absolute terms,
this is as true of RPG as it is of most compiled languages. However, were dealing here with a specific problem space. Namely, that the range of
calculations required is finite as are the names and number of variables that might be involved in the calculations. In fact, the variables are already
defined in the program since the files that contain them are already being used by the program. So providing we don't mind doing a bit of grunt workto set up the basic definitions, while we may not be able to provide a total solution, we can go a long way.
When you face problems like this, rather than taking a head-on approach, try instead to determine exactly what inhibits you from doing what you
want. Understanding that, ask yourself what constraints would have to be in place for you to overcome this problem. If, as in this case, those
constraints are both acceptable and practical, then you have a solution.
In our next EXTRA article, we'll discuss some ideas for taking these techniques to the next level and making the overall process even more flexible. In
the meantime, if you use these techniques or have any questions, please let us know.
Note:We didnt have space to introduce you to using basing pointers and procedure pointers, and it isnt necessary for you to understand them to use
these techniques. However, if youre unfamiliar with the topics and want to know more, check out Some Pointers on Using Pointers in RPG IV and
the section on "Using procedure pointer calls" in the RPG Redbooks publication Who Knew You Could Do That with RPG IV?.
Page 123456
Jon Paris is a technical editor with IBM Systems Magazine and co-owner of Partner400.
More Articles From Jon Paris
Susan Gantner is a technical editor with IBM Systems Magazine and co-owner of Partner400.
More Articles From Susan Gantner
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Even More Flexible Calculations
E-Newsletter Exclusive | In the September EXTRA e-Newsletter, Jon Paris and Susan Gantner shared some solutions to &qout;unsolvable&qout;
RPG problems with a technique for flexible calculations. Now they delve deeper with a more complex example, making a sequence of calculations
not only possible but simple to create and use.
RPG - Anchoring Your Team
Cover Story | Alternate approaches to extending your RPG applications.
The State of Modernization
Cover Story | Bruce Vining talks modernization with Jon Paris and Susan Gantner
RPG for the Web
iSeries EXTRA: By Now, the Case for RPG IV Should Be a No-Brainer
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