RE: Checking for an odd number

TESTB in /FREE
Something like this, but I don't have the exact syntax in front of me...

0123 4567
xxxx x1xx

If  %bitAnd(X'04' : lastByteOfNum) 
//  value is odd.
Endif


-Bob Cozzi
www.RPGxTools.com
RPG xTools - Enjoy programming again.

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of dkahn@xxxxxxxxxxxxxxxxx
Sent: Tuesday, October 18, 2005 5:33 AM
To: RPG programming on the AS400 / iSeries
Subject: Re: Checking for an odd number





"D.W." <dpalme@xxxxxxxxxxx> wrote:

> I have a need to determine whether or not a numeric value is an
> even or odd number when cycling through a PF..
>
> Is there a simple way to accomplish this within RPG without having
> to resort to some complicated mathematical formula?

Just for giggles here is a quirky and old-fashioned but highly efficient
way to do it. It seems to be about ten times faster than the
remainder-from-divide-by-2 method. It has to be in traditional format as
TESTB is not supported in free. In this case the number to be tested is
packed decimal. If it is zoned or binary, factor 2 of the TESTB operation
would need to be '7'.

*************** Beginning of data *************************************
d                 ds
d num                     1      3p 0
d  lastByteOfNum          3      3a
d numberIsOdd     s               n

c                   for       num = -10 to 10
c                   testb     '3'           lastByteOfNum            30
c                   eval      numberIsOdd = *in30

c                   if        numberIsOdd
c     'odd'         dsply                   num
c                   else
c     'even'        dsply                   num
c                   endif

c                   endfor

c                   eval      *inlr = *on
****************** End of data ****************************************

--
Dave...
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