Re: purpose of Z-ADD?

[Vern Hamberg <vhamberg@xxxxxxxxxxx>]

Buzz

EVAL is a late addition to RPG - it was never a part of RPG III. It was 
added as an op-code that let you put free-form expressions in an 
expanded factor 2. EVALR came a little later, to provide what MOVE used 
to do, vs. MOVEL.

So we used to have to use Z-ADD to set a variable to a value.

HTH
Vern

On 3/24/2011 11:09 AM, Buzz Fenner 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!  :)
>
> Luke,
>
> In case it hasn't been mentioned (or it has and I missed it), when pumping
> numeric values from one variable to another -of a larger length than the
> originating variable- if it wasn't 'initialized' via z-add0 prior to the
> MOVE it resulted in an execution error with invalid data in a numeric field.
>
> Ah, the bad old days...
>
> Buzz