RE: Need for separate Input and Output Areas in Display File

Ravi,

You're not required to have separate I-O areas in your program
for a display file.  There may be a slight performance advantage
for sending a smaller amount of data to the display but I have
never noticed it.

Generally, I code all of my fields as B (input/output) and then
use the DSPATR(PR) and CHGINPDFT keywords on those fields that
are only required for output.  This allows you to copy only
the *output* (-O) records into your program. This eliminates
the need for qualification and allows a single record structure
to work with.  I believe it makes the code easier to understand.

Its also easier on my brain :)

Terry

> -----Original Message-----
> From: Ravi Prasanna Annasagara Nagarajan
> [mailto:ravi.annasagara@wipro.com]
> Sent: Tuesday, August 13, 2002 6:13 AM
> To: cobol400-l@midrange.com
> Subject: Need for separate Input and Output Areas in Display File
>
>
> This is a multi-part message in MIME format.
> --
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> [ Picked text/plain from multipart/alternative ]
> Hello
>
> This is a pretty basic question. Why do we need to separate Input and
> Output Areas in display file? Is there any advantage in that?
> The reason I am asking this question is because we do not do any such
> thing in RPG programs. So why is it required in Cobol programs?
> Does it provide any performance enhancements?
>
> Many thanks in advance.
>
> Regards,
> Ravi Prasanna A.N.
> mailto:ravi.annasagara@wipro.com
>
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