RE: MOVEA -> EVAL

["Phil" <sublime78ska@xxxxxxxxx>]

>bad indicators, bad!

Just how are you supposed to communicate to a display file?  If a user
entered an invalid entry, how are you supposed to tell the display file to
highlight the field in red, and to position the cursor on that field?  Is
there something new for me to learn?

Phil


-----Original Message-----
From: owner-rpg400-l@midrange.com [mailto:owner-rpg400-l@midrange.com]On
Behalf Of Jim Langston
Sent: Friday, June 15, 2001 7:10 PM
To: RPG400-L@midrange.com
Subject: Re: MOVEA -> EVAL

Hmm.. I would have to argue, however, that MOVEA is not the "best"
solution in this case.  The "best" solution is to either get rid of
the indicators altogether (bad indicators, bad!) or set them thus:

C             Eval    *IN41 = *Off
C             Eval    *IN42 = *Off

Why?  Maintainability.  I'm maintaining a huge program.  I want to use a
new indicator or see where one is used, such as *IN42.  So what do I do?
I hit F10, type 42 and press F16 to search for 42.  And I find out where
indicator 42 is used (and a lot of line number 42's, etc...).

Using your method, I would be oblivious to the fact that, in the first case
*IN42 is in fact being used and is being turned off, and in the second case
is being used and is being turned on.

If I ran across this code in a program I was maintaining I would immediately
replace the code with Eval  *IN41 = *Off etc...

On a related note, S36 code conversation to native RPG and RPGIV would be
much, much easier if programs didn't use all kinds of tricks.

Regards,

Jim Langston

Me transmitte sursum, Caledoni!

Peter Dow wrote:
>
> Hi Barbara,
>
> I ran across this piece of code today, and while I realize this isn't the
> "best" solution, it was pretty common in pre-RPGLE days:
>
> C                   MOVEA     '0000'        *IN(41)
> Set indic.
>
> In the days when a lot of indicators were required to do things with a
> display file, this was a common technique to turn off a range of
indicators.
> It could also be used to both seton and setoff indicators within a range,
> e.g.
>
> C                   MOVEA     '01010101'    *IN(41)
> Set indic.
>
> which reduced two SETON/SETOF statements to a single line of source code.
>
> Thought you might be interested.
>
> Peter Dow
> Dow Software Services, Inc.
> 909 425-0194 voice
> 909 425-0196 fax
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