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Odd bit of COBOL

 
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socker_dad

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Joined: 05 Dec 2006
Posts: 166
Location: Seattle, WA

PostPosted: Tue Jul 09, 2019 4:46 am    Post subject: Odd bit of COBOL
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Here's an odd bit of COBOL:
Code:

PERFORM 5500-PARAGRAPH
  VARYING WS-SUB-1 FROM +1 BY +1
       UNTIL WS-SUB+1 > WS-LIC-STATUS
       AFTER WS-SUB-2
         FROM +1 BY +1
        UNTIL WS-SUB-2 > WS-LIC-STATUS


Is this like an inner loop on WS-SUB-2 with WS-SUB-1 being the outer loop? Such as the paragraph is performed until WS-SUB-2 is greater than the licenses status, then WS-SUB-1 is increased by 1 and we loop through WS-SUB-2 until it is greater than the licenses status again?

If that isn't what it's doing, does someone have an explanation?
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8455
Location: Dubuque, Iowa, USA

PostPosted: Tue Jul 09, 2019 7:38 am    Post subject: Reply to: Odd bit of COBOL
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You could have coded up a test for this using a DISPLAY for 5500-PARAGRAPH in maybe 10 minutes and you would have gotten your answer much earlier.

Your assumption about how the PERFORM works is correct -- WS-SUB-2 is varied from 1 to WS-LIC-STATUS for each value of WS-SUB-1 starting at 1 and continuing until WS-LIC-STATUS. This is assuming, of course, that the typo error in your code is corrected (WS-SUB+1 could be either WS-SUB-1 + 1 or WS-SUB-1); your comments are assuming the latter case.
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Rohit Umarjikar

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Joined: 21 Sep 2010
Posts: 2173
Location: NY,USA

PostPosted: Tue Jul 09, 2019 3:29 pm    Post subject:
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This shall explain the concept for this and more of a such scenarios.
https://www.ibm.com/support/knowledgecenter/en/SS6SG3_4.2.0/com.ibm.entcobol.doc_4.2/PGandLR/ref/rlpsperf.htm
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socker_dad

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Joined: 05 Dec 2006
Posts: 166
Location: Seattle, WA

PostPosted: Tue Jul 09, 2019 8:19 pm    Post subject:
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Thanks guys! Tremendous help as always!
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