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What is this really doing???

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Last Modified: 2018-11-21
I've inherited some 10+ year old code without benefit of the original programmer... can anyone explain the usefulness of this code segment, or at least reduce to something more sensible?

                                                       Display Module Source                                                        
                                                                                                                                   
C  N31USERN         CABNE     *ALL' '                            3131--                                  

Thanks in advance ;)
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Commented:
I don't know RPG but from a quick google, looks like compare and branch:
https://www.ibm.com/support/knowledgecenter/SSPSQF_9.0.0/com.ibm.etools.iseries.langref.doc/evferlsh266.htm
David Johnson, CDSimple Geek from the '70s
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Distinguished Expert 2019

Commented:
The code is probably 20-40 years old. RPG is very column sensitive.. The last time I worked in RPG II was in 1980.
C (we will be doing a compare
N31USERN      Operand 1 variable
CABNE  - compare and branch if not equal
*ALL' '      compared to this is a literal not a variable
3131--        Tag or variable                            


http://www.go4as400.com/rpgle-opcodes/as400.aspx?cid=205
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Commented:
Thanks everyone! It seems I purged all this knowledge during Y2K, and frankly never used left-side indicators in conjunction with a factor variable.

I've a long uphill battle to update these programs to /Free... without the /Free of course ;)

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