Re: Using % type functions

[boothm@xxxxxxxxxxxxxxxxx]

Hans, I'd love to use the example in this post but I don't understand it. 
Learning them out of book is not easy.  This is a good example.  Simple 
process and clearly explained yet I have no idea where to even start. 

Now, I am aware that I'm not a boy genius, but I also know I am not the 
stupidest RPG programmer in the world.  This stuff is not as easy to learn 
as you guys think.  In my experience, the examples start at about Chapter 
3. 

Remember how Coach Lombardi started every season?  "Gentlemen, this is a 
football."
_______________________
Booth Martin
boothm@earth.goddard.edu
http://www.spy.net/~booth
_______________________




boldt@ca.ibm.com
Sent by: owner-rpg400-l@midrange.com
02/03/2000 08:59 AM
Please respond to RPG400-L

 
        To:     RPG400-L@midrange.com
        cc: 
        Subject:        Re: Using % type functions




Peter wrote:
>What you need to do is convert the subroutine to a procedure, i.e. 
replace
>the BEGSR/ENDSR with P-specs, add a prototype defintions (D-spec type
"PR")
>in the main part of the program and a matching procedure interface within
>the procedure. These define the parameters passed to the procedure. Then
you
>can use it as you described, but without the percent sign:
>
>> C           Eval   BSDPuR = MoveMDYToDate(CMDPuR)
>
>Another advantage of converting to a procedure is that the procedure can
>have local variables.
>
>For more details, they're all in the ILE RPG Reference manual. I'm pretty
>sure they were available for V3R7, but not totally sure...


V3R2/V3R6 actually.  In other words, no one has any excuse
not to use them.

Some advantages:
-- local variables
-- compile-time type checking of parameters
-- VALUE parameters
-- CONST parameters
-- passing expressions for VALUE and CONST parms
-- better modularization of apps
-- ability to call C runtime functions
-- return values from procedures
-- easier to share and reuse code

Why would anyone NOT want to use procedures?

Cheers!  Hans

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com


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