RE: subprocedure questions

["Bob Cozzi" <cozzi@xxxxxxxxx>]

The problem is that you have the VALUE keyword specified.
You can not use VALUE or CONST on any parameter that whose value you
want to modify and return to the caller.

If you use CONST, the parameter's data is read-only.
If you use VALUE, the parameter is copied to a temporary storage
location, and that copy is passed to the procedure, thus allowing you to
modify the parameter within the proc, but what you are modifying is a
copy of the data, not the original parameter it self.

So just remove the VALUE keyword and it should work the way you want it
to.

Bob Cozzi


-----Original Message-----
From: rpg400-l-admin@midrange.com [mailto:rpg400-l-admin@midrange.com]
On Behalf Of D B
Sent: Thursday, November 07, 2002 7:53 AM
To: rpg400-l@midrange.com
Subject: subprocedure questions

I'm an old hand at RPG-IV coding, but a newbie with
subprocedures.  I'd like to isolate a new subroutine
into a subprocedure, mostly for isolating the
subprocedure's variables but also to get started in
using procedures.  I have glossed over the
easy-to-read-NOT F.M., in fact, followed an example of
a subprocedure it provided.

I have a working version of a very simple program
using the SUBROUTINE; this program works.  I copied
the source into another source and converted the
subroutine into a SUBPROCEDURE, and got it to compile
after several mods, but the results from the
subprocedure are not coming back to the main module.

Here's the procedure definition and the CALLP in the
main module:

     D CVTA2N          PR
     D   ACGAMT                      10A   VALUE
     D   N_ACGAMT                     8S 2 VALUE
     D   Z_AMTERR                    30A   VALUE

     C    .......   CALLP     CVTA2N(ACGAMT :
                                     N_ACGAMT :
                                     Z_AMTERR )

Here's the procedure module:

     P CVTA2N          B
     D CVTA2N          PI
     D   ACGAMT                      10A   VALUE
     D   Z_ACGAMT                     8S 2 VALUE
     D   Z_AMTERR                    30A   VALUE
<snip>
     C    .........  EVAL      Z_ACGAMT = N_ACGAMT
     C    .........  RETURN
     P                 E

I am attempting to return the values for Z_ACGAMT and
Z_AMTERR back to the main module, but am getting
nothing.

Any hints?

TIA, Dan

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