The last two TechTips provided some insights about the process of converting RPG “classic” code to free-format. This one covers a topic often overlooked, but extremely important: handling arrays.
Written by Rafael Victória-Pereira
Aside from the terrible trio (CABXX, TAG, and GOTO), I discussed in the previous TechTip another fact that’s hard for some to swallow: that MOVEA didn’t make it to free-format. This operation code is used for some specialized assignment functions related to arrays; it transfers character, graphic, UCS-2, or numeric values from factor 2 to the result field. However, there are some restrictions when moving numeric values. (Check IBM’s ILE RPG Reference Manual for details if you need to refresh your memory.) One of the fields must contain an array, and the fields cannot specify the same array, even if the array is indexed. The following operations are allowed:
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