Finish? Don't leave us hanging, please?
-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of broehmer@xxxxxxxxxxxxxxx
Sent: Tuesday, February 20, 2018 9:22 AM
To: RPG programming on the IBM i (AS/400 and iSeries) <rpg400-l@xxxxxxxxxxxx>
Subject: Re: Simple RPG question (because the docs are worthless)
RPG CAFE on DeveloperWorks can sometimes be really helpful. This is from Barbara in 2012.
Just search for "Eval M".
The M extender tells the compiler to reduce the chance of overflow for a sub-expression by maximizing the number of integer places in the compiler temporaries. So if a temporary value might need to have 75 digits and 20 decimal places (55 integer places), the compiler would make it 63 digits and 8 decimal places (keeping 55 integer places).
The R extender tells the compiler to reduce the chance of loss of accuracy for a sub-expression by not letting the number of decimal places in the compiler temporaries go below the number of decimal places in the result. So if you have
res = (x / y) * p + (q / r / s)
From: john erps <jacobus.erps@xxxxxxxxx>
To: "RPG programming on the IBM i (AS/400 and iSeries)"
<rpg400-l@xxxxxxxxxxxx>
Date: 02/20/2018 08:10 AM
Subject: Simple RPG question (because the docs are worthless)
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>
Hi,
What does the "operation extender" M means I know R and H, but not M.
I tried to look into the RPG docs, at opcode "eval" which seems to me a logical place to document this, but no. The extenders are mentioned but i can't find the doc for M (or R or H). When i click "precision rules" i get to see doc about "operation extender" R.
Man how bad is the RPG documentation on IBM's site. It's terrible.
How on earth is somebody not already having 20+ years of experience in RPG ever going to find some info. A simple function like "half adjust" is buried as some "operation extender" (instead of a normal half-adjust function or BIF or whatever), and the doc on this "operation extender" H is almost impossible to find.
Pff, the only thing worse would be no doc at all. Terrible.
Sorry for the rant...
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