Cobol program with sequence number randomly generates spaces

shreya19 · New User Joined: 13 Mar 2014 Posts: 34 Location: USA

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

Robert Sample · Posted: Wed May 31, 2023 3:22 am

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.

Rohit Umarjikar · Posted: Thu Jun 01, 2023 6:26 pm

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.

shreya19 · New User Joined: 13 Mar 2014 Posts: 34 Location: USA

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

sergeyken · Posted: Fri Jun 02, 2023 5:24 pm

prino · Posted: Fri Jun 02, 2023 5:27 pm

Use Debug Tool, and single-step through your code.