Re: purpose of Z-ADD? (was: Question about legacy coding style)

[Luis Rodriguez <luisro58@xxxxxxxxx>]

Luke,

Long before EVAL, there was (among others) an ADD operation code. So, you
could either ADD a value to an existing value, without clearing it first, or
use Z-ADD, that meant something like "ZERO" first the variable and THEN add
the new value. It went something like this:


Z-ADD 5  VAR
** (VAR now has 5)
ADD 10 VAR
** (Var now has 15)

etc.

HTH,

Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries
--



On Thu, Mar 24, 2011 at 8:47 AM, Luke Gerhardt <lgerhardt@xxxxxxxxx> wrote:

> Since it was mentioned here and tickled a neuron...I might as well ask:
> I've always wondered, what is the purpose of Z-ADD?  Isn't it just the
> same to EVAL = 0, or EVAL = whatever you really want it to be?  Or is
> this just a legacy leftover that only still exists in order to mess with
> my mind?
>
> Thanks!  :)
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