The check for a null address is not guaranteed to work.
Checking the %PARMS() should be done prior to checking the %ADDR().

Here's a (relatively recent) thread discussing the issues with only
using %ADDR() instead of %PARMS() when checking optional parameters:

http://archive.midrange.com/rpg400-l/201103/msg00205.html


Chris Hiebert

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Addison
Sent: Friday, April 13, 2012 11:05 AM
To: 'RPG programming on the IBM i / System i'
Subject: RE: Can RPG procedures in a *SRVPGM have optional parameters?

Another option is to check if the address of the parameter is *Null or
not.

If %addr(optional1) <> *Null;
....


Alan Addison


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