RE: Need for separate Input and Output Areas in Display File -- COBOL400-L

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Subject: RE: Need for separate Input and Output Areas in Display File
From: "Joe Pluta" <joepluta@xxxxxxxxxxxxxxxxx>
Date: Tue, 13 Aug 2002 08:35:15 -0500
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ARGH!  Careful here.  I just got bitten by this particular issue.

> > WORKING-STORAGE SECTION.
> > 01  HEADER-OUTPUT.
> >     COPY DDS-HEADER-O   OF PAD0137NW.
> > 01  HEADER-INPUT.
> >     COPY DDS-HEADER-I   OF PAD0137NW.

This creates separate spaces in memory for each object.  There is no chance
for one to overlay the other.

>        01  DSPFILE-area.
>            copy dds-m1map-o     of OE314D.
>            copy dds-m2ctl-o     of OE314D.
>            copy dds-m2sfl-o     of OE314D.
>            copy dds-m2key-o     of OE314D.

With THIS technique, however, each record shares the same memory location.
Changes to dds-m1map-o", for example, are reflected in "dds-m2ctl-o".  If
you're lazy and don't update your variables prior to each WRITE operation,
you can get decimal data errors quite easily.

Joe

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Follow-Ups:

Re: Need for separate Input and Output Areas in Display File , Hamid Ghaffari
Re: Need for separate Input and Output Areas in Display File , R. Bruce Hoffman, Jr.

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