RE: add to *Null pointer does not throw an exception.

For this to be the case, however, MI's Null pointers would have to be the same 
as RPG's Null pointers, are we sure this is the case?

Take, for instance, DB Null fields.  There is a bit value set saying it is a 
Null capable.
On the other hand, in C NULL is usually defined either as 0, or as a pointer to 
memory address 0.
Do we know for a fact how a Null pointer is handled in RPG?  Do we know, for a 
fact, wither it is pointing to 0, or does it have a Null bit set?

Regards,

Jim Langston

-----Original Message-----
From: Steve Richter [mailto:srichter@autocoder.com]

-----Original Message-----
From: rpg400-l-admin@midrange.com [mailto:rpg400-l-admin@midrange.com]On

>What makes you think there is a one-to-one mapping of Eval  Ptr = Ptr +
>32 to MI's AddSpP instruction?

Hi Gary,

I'm presenting the MI behavior as confirmation of what I would expect to 
happen.  Whenever the system cannot perform the instruction it should signal an 
exception. Adding to a null pointer is something that the system cant do and it 
has to tell, that is signal, the executing program of that condition.