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How to reverse a string using DFSORT?

 
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Megha Gupta

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Joined: 15 Mar 2012
Posts: 5
Location: India

PostPosted: Wed Jan 22, 2014 6:07 pm    Post subject: How to reverse a string using DFSORT?
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Hello All,

How to reverse a string for ex: "STUDENTS into STNEDUTS" using DFSORT?
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enrico-sorichetti

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Joined: 14 Mar 2007
Posts: 10603
Location: italy

PostPosted: Wed Jan 22, 2014 6:15 pm    Post subject: Reply to: How to reverse a string using DFSORT?
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pretty boring, but ...
use BUILD/OVERLAY moving byte per byte in reverse order
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Bill Woodger

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Joined: 09 Mar 2011
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PostPosted: Wed Jan 22, 2014 6:42 pm    Post subject: Reply to: How to reverse a string using DFSORT?
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You have to code the reverse. It is a rare need, so don't expect any built-in way to do it.

OVERLAY would be more exciting, because you'd need an extra byte.

BUILD creates a new current record, so no extra byte needed.

Examples with Fixed-length records:

Code:
BUILD=(3,1,2,1,1,1)


Would make ABC into CBA

Code:
OVERLAY=(3,1,2,1,1,1)


And bearing in mind the default start position for OVERLAY of 1 (for F, 5 for V) would make ABC into CBC, because by the time it gets to 1,1, that position has already been replaced by 3,1.
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Pandora-Box

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PostPosted: Wed Jan 22, 2014 8:35 pm    Post subject:
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If you have the cusion of using COBOL (FUNCTION REVERSE ) would be handy...
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daveporcelan

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Joined: 01 Dec 2006
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Location: Pennsylvania

PostPosted: Wed Jan 22, 2014 8:42 pm    Post subject:
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If the data is not too large, you could write a small Rexx exec.

This would help with different length fields and eliminate trailing spaces becoming leading spaces (with a Strip function).

You could run it in batch.

I guess more complete requirements would help (as usual).
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