RE: diff btw Procedures and Routines

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The short, flippant answer is "Yes."

Dynamic calls and calls to procedures in service programs can be coded
exactly the same except on the PR line in the prototype you'd use "extpgm"
for the dynamic call and "extproc" for the service program procedure.  Use
"callp name(parms)".

Personally, I'd code it as a service program, but I think the real answer is
"It depends."  If it gets called by OPM programs, it's probably better as a
dynamic call.  You can use a prototype and callp in RPGIV programs and the
old call with plist in the OPM stuff.  I'd definitely write the program with
a prototype and procedure interface instead of a *entry plist.

> -----Original Message-----
> From: Booth Martin [mailto:Booth@MartinVT.com]
> Sent: Thursday, August 15, 2002 9:50 AM
> To: rpg400-l@midrange.com
> Subject: RE: diff btw Procedures and Routines
>
>
> --
> --
> [ Picked text/plain from multipart/alternative ]
> I've been 5 years trying to get this straight and am still
> confused.  Lets
> say I have a utility program that is a pop-up calendar.  The
> parm is a date.
>   Should this be a program or a procedure?
>
>
>
> ---------------------------------------------------------
> Booth Martin   http://www.MartinVT.com
> Booth@MartinVT.com
> ---------------------------------------------------------
>
> -------Original Message-------
>
> From: rpg400-l@midrange.com
> Date: Thursday, August 15, 2002 12:45:09
> To: 'rpg400-l@midrange.com'
> Subject: RE: diff btw Procedures and Routines
>
> A procedure is encapsulated, where a subroutine is not.
>
> That is, a procedure can see variables that it defines, but
> not variables
> that the main program defines. This makes it a lot easier to
> determine what
> a procedure is actually doing and where it's getting it's
> return value(s).
>
> This makes a procedure "stand alone", and can be used in
> other programs with
> little modification (modification required for any File I/O
> may be required)
>
>
> It can be extremely difficult to copy a subroutine to another
> program, as
> you have to determine all the variables the subroutine uses,
> and what these
> are supposed to be set for, etc...
>
> I have been known to break my RPG IV program into Subroutines
> when it starts
> getting too large to group the logic. Whether or not these
> should be broken
> up into Procedures is probably a personal choice. But,
> subroutines that
> calculate a value or such, those I would put into Procedures.
>
> Regards,
>
> Jim Langston
>
> -----Original Message-----
> From: MURALI DHAR [mailto:nmuralidhar@rediffmail.com]
>
> why do we use procedures only in modules in ILE programs?why nt
> subroutines?whats the diff ...plz kindly answer me
> Best regards
> Murali
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