dynamic array Archives - IT Jungle

Guru: Dynamic Arrays Come To RPG – Limitations, Circumventions, And More

October 12, 2020 Jon Paris

In my first two tips in this series I covered the basics of automatic sizing arrays and variable sized arrays. In this final part am going to discuss some of the current limitations in this support and the facilities IBM has put in place to help circumvent them.

IBM publishes an extensive list of the limitations, but in normal usage only a couple present “real” restrictions in practical terms. If you are curious though, you can find the full list here.

Limitations

The first limitation to bear in mind is that, currently, only top-level variables can be defined …
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Guru: Dynamic Arrays Come To RPG – The Next Part Of The Story

August 17, 2020 Jon Paris

In my first tip on this topic I covered the automatic sizing option (*AUTO) for the new dynamic arrays. In this tip I am going to look at the second option (*VAR), which allows the programmer to directly control the capacity of the array, growing and shrinking it as required. In addition I will also briefly cover the third option (*CTDTA) which, as you may have guessed, relates to compile time arrays.

Using A Varying Length Array

Let’s start with a brief example of using a variable sized array in conjunction with SQL. This approach answers the classic question of …
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