RE: Eval Errors

[Joel Fritz <JFritz@xxxxxxxxxxxxxxxx>]

Eval was designed so that overflow would be a hard error.  I think the
easiest way to handle it is to make sure the receiver value is large enough
for any result of the calculation if there's no division involved, and if
there's division by numbers between 0 and 1, check for the too small
non-zero divisor.

There are other things you can do that are more complicated involving
conditon handlers and the PSSR.

IMHO, the only difference between the old arithmetic opcodes and using eval
with expressions is that the old opcodes masked overflow errors.  Have you
ever had an end user point out numbers that were too small that turned out
to be the result of overflow and truncation?  To me this is a design issue,
and not a data issue.  If you are getting numbers that are too large for
their destination from a correct calculation that uses valid data, the error
is in the size of the field that is assigned the result of the calculation.

-----Original Message-----
From: JamesRMoore@aol.com [mailto:JamesRMoore@aol.com]
Sent: Friday, June 16, 2000 6:44 AM
To: RPG400-L@midrange.com
Subject: Eval Errors


I am sure this has been covered before, but...
I am do the maintenance for a bunch of programs that use Eval for
calculations.  Every once in awhile I get the error that the field is not
big enough.  

What is the best way to use eval to avoid this?
Thanks, Jim
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