copy file data in reverse order in another file

arjunbathula · New User Joined: 17 Jul 2007 Posts: 3 Location: hyderabad

Hi,
In my interview, the interviewer ask how to copy data in one file having records 1,2,3,4......50 to another file in reverse order i.e, 50,49,48,47,46.....1. If any one knows tell me the answer.

CICS Guy · Posted: Thu Apr 29, 2010 11:57 pm

Copy, no, but a sort with sequence numbers inserted to each record and sorted into descending order should work fine.

Mathiv Anan · Active User Joined: 23 Jul 2008 Posts: 106 Location: USA

Please check Anuj's post in this link. It might help.

http://www.ibmmainframes.com/viewtopic.php?t=48304&highlight=copyback

Also this has been answered before a couple of times.

Anuj Dhawan · Posted: Fri Apr 30, 2010 5:50 pm

arjunbathula - You must have asked the interviewer, what are my choices to pick from - COBOL, SORT, File-Aid... because if there are only 50-records, reading the file in a COBOL array and writing from the last record til first must have not been be a problem.

For regular business situations, where you need to deal with millions of records, this question, to start with, has no practical grounds! And COBOL for usre should not be your choice.