Re: How to read and or statement

[Vern Hamberg <vhamberg@xxxxxxxxxxx>]

David

If at all possible, completely stop using the opcodes that combine the 
control with the test - DOUEQ is a DOU control with a test for EQ - 
equality. Use only the controls - then the extended syntax that lets you 
use parentheses.

Now it is still true that AND has higher precedence - you could write 
the same cobbled-up mess using the extended syntax. But it is much 
easier to get the thing you asked for, if I remember what that was.

I sometimes relate the precedence of AND and OR to those of 
multiplication/division and addition/subtraction - yes, purists may 
quail at this - but it does make some sense for me. Multiplication has 
higher precedence - same concept for how to organize with/without 
parentheses.

Good luck changing all the code that uses those antiquated opcodes. This 
is also another reason to get away from *QRYDFNs and go with *QMQRYs - 
those stinking selection settings!!!

Ranting before a vacation day, much needed! Not the ranting, the vacation!!

Vern

On 11/10/2010 11:24 AM, David FOXWELL wrote:
> note to self : AND has higher precedence...AND has higher precedence...AND has higher precedence...AND has higher precedence...AND has higher precedence...AND has higher precedence...AND has higher precedence...AND has higher precedence...AND has higher precedence...
>
>
>
>
> > -----Message d'origine-----
> > De : rpg400-l-bounces@xxxxxxxxxxxx
> > [mailto:rpg400-l-bounces@xxxxxxxxxxxx] De la part de Elbert Cook
> > Envoyé : mercredi 10 novembre 2010 14:35
> > À : 'RPG programming on the IBM i / System i'
> > Objet : RE: How to read and or statement
> >
> > Here is a clip from the V5R4 RPG Reference
> >
> > Condition for the DOUxx, DOWxx, IFxx, and WHENxx operations.
> > The ANDxx operation has higher precedence than the ORxx operation.
> >
> >
> > -----Original Message-----
> > From: David FOXWELL [mailto:David.FOXWELL@xxxxxxxxx]
> > Sent: Wednesday, November 10, 2010 4:09 AM
> > To: RPG programming on the IBM i / System i
> > Subject: How to read and or statement
> >
> > Consider this code :
> >
> > C     *INKF         WHENEQ    *ON
> > C     CONDITION1    ANDEQ     FALSE
> >
> >   *If I add :
> > C     CONDITION2    OREQ      FALSE
> >
> >
> > I think this now means :
> >
> > IF (*INKF AND CONDITION1=FALSE) OR (CONDITION2=FALSE)
> >
> > But I want :
> > IF *INKF AND (CONDITION1=FALSE OR CONDITION2=FALSE)
> >
> > Which is right?
> >
> > Thanks