Exclusive-or (was: Re: Biton/Bitoff)

Don:  Even with all the expression goodies we've added to RPG over
the past few years, we still have not made bit twiddling any easier.

However, if you want to do exclusive-or in a conditional expression,
you can use the <> operator.  For example, the <> in the following
statement acts just like exclusive-or:

        IF               (A<17) <> (B=10)

That is, the condition is true only if the results of (A<17) and (B=10),
are not the same.

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com


---------------------- Forwarded by Hans Boldt/Toronto/IBM on 98-03-19 09:01
---------------------------


owner-midrange-l@midrange.com on 98-03-19 01:08:26
Please respond to MIDRANGE-L@midrange.com @ internet
To: dmorris@plumcreek.com @ internet
cc: MIDRANGE-L@midrange.com @ internet, scott71@hpnc.com @ internet
Subject: Re: Biton/Bitoff



Since we're on this string, is there a easy implementation of a XOR
function with this or is there a XOR builtin that I've overlooked??

Don in DC metro...



On Wed, 18 Mar 1998, David Morris wrote:

> Scott,
>
> Looks like the hard way to arrive at *loval, *blank, shift zero or "A"
(Assuming english EBCIDIC).  The
> bitof is like moving *LOVAL to the field.  The biton sets the corresponding
bit on so you get
> if N60/N61 00000000 x'00', 60/N61 10000000 x'80', N60/61 01000000 = x'40', or
60/61 11000000
> = x'C0'.  x'00'=loval, x'80'=shift zero, x'40'=blank, x'C0'=A.  If you have
the windows calculator it is
> real easy to convert the values.  Just switch between binary and hex.  I
don't go back far enougth to
> know if those values are special or not but the hex '80' is a easy to
missinterpret, it displays as a zero
> on most terminals but is definitely not a zero.
>
> David Morris
>
> >>> "Scott Swaim" <scott71@hpnc.com> 03/20 2:13 PM >>>
>         Never having programmed the to opcodes, What are they?  That do they
do?
>
> Please explain what is happening with this code.
>
>
> C                                 BITOFF     '01234567'         SS1    1
> C           60                 BITON       '0'                         SS1
> C           61                 BITON       '1'                         SS1
>
>
>
>
> TIS
>
>
>
> Scott Swaim
> scott71@hpnc.com
> http://www.qualitycorps.com
>
>



!
!
!
  !
>




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