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Cobol program with sequence number randomly generates spaces


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shreya19

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Joined: 13 Mar 2014
Posts: 34
Location: USA

PostPosted: Wed May 31, 2023 1:58 am
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Hi,

I have a COBOL program which generates 2 byte sequence numbers and writes to a file.
It basically adds only sequence numbers to already existing file.
In roughly 1 in 30 runs, it generates spaces instead of proper sequence in one of the rows. I tried with same input data and parms. Unable to find out the cause for this random behaviour. Any leads would be appreciated
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8698
Location: Dubuque, Iowa, USA

PostPosted: Wed May 31, 2023 3:22 am
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With the limited information available, I suspect table overflow. You might want to turn on the subscript range checking for a few runs to determine if it is the problem.
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Rohit Umarjikar

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Joined: 21 Sep 2010
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Location: NYC,USA

PostPosted: Thu Jun 01, 2023 6:26 pm
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Two things -
1. Add proper displays and rerun to see the pattern of the path it takes to executes the code and find the bug.
2. If you can’t reproduce then have proper displays i the code before it happens again to know the cause.

Point #1 would help you to solve though.
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shreya19

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Joined: 13 Mar 2014
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Location: USA

PostPosted: Fri Jun 02, 2023 8:25 am
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I tried adding multiple displays.
The record just before Rewrite statement has the correct sequence number. However, the file has it missing.

File is opened in I-O mode, recording mode is V
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sergeyken

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Joined: 29 Apr 2008
Posts: 2081
Location: USA

PostPosted: Fri Jun 02, 2023 5:24 pm
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shreya19 wrote:
I tried adding multiple displays.
The record just before Rewrite statement has the correct sequence number. However, the file has it missing.

File is opened in I-O mode, recording mode is V

If you really want some help or advice, please present the exact examples of your code, and data.

Otherwise it sounds like:
Quote:
I do everything right, but the result is wrong.
Please help me to fix my problem!
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prino

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Joined: 07 Feb 2009
Posts: 1308
Location: Vilnius, Lithuania

PostPosted: Fri Jun 02, 2023 5:27 pm
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Use Debug Tool, and single-step through your code.
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