Using that example, you could, if you wanted, use *zeros instead of a line of 0's:
coldta = %subst( *zeros: 1: cwdth( #col ) - %len( coldta ) ) + coldta;
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Arthur Marino
Sent: Wednesday, March 25, 2009 2:08 PM
To: RPG programming on the IBM i / System i
Subject: RE: Using an Expression to control a FOR loop
I just went back to the manual and it's true that you CAN'T specify
variable names for the 2nd (length) and 3rd (dec pos) parms of %dec.
Unless they represent values that are known at compile time. These 2
values aren't known until run time so my code needed to be more
flexible.
Now that it's been pointed out to me that the entire FOR expression is
evaluated at the 'endfor' (I thought it was evaluated once and just
tested at 'endfor'), I see why it didn't work at first. I still like
Terry's solution 'cause it's fewer instructions than mine and 123
correctly becomes 00123.
coldta = %subst( '000000000000000' // "lots" of zeros
: 1
: cwdth( #col ) - %len( coldta )
) + coldta;
Arthur J. Marino
RockTenn Corporation
(631) 297-2276
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Douglas Handy
Sent: Wednesday, March 25, 2009 2:13 PM
To: RPG programming on the IBM i / System i
Subject: Re: Using an Expression to control a FOR loop
Alan,
And I don't believe (PLEASE CORRECT ME IF I'M WRONG) I can code " ColDta
= %Editc(%Dec(%Trim(ColDta):VARIABLE_WIDTH:VARIABLE_DECPOS):'X')".
What I'd suggest is you move the "editing" to a subprocedure where you
can
hide the complexity. That way your inline code stays cleaner and more
readable (assuming a properly named procedure). Pass the desired length
and
decimals to the subprocedure, and your inline code should be readable.
Then do whatever you have to in the procedure, and comment it as
necessary
so the next guy can follow it. But at least the ugly code will be
localized.
One thing the procedure could do is call QECCVTEC to create an "edit
mask"
using a passed in length, decimals, edit code, etc. Then that edit mask
(which you can re-use) can be passed to QECDT to perform the actual
editing
of the field. But those APIs may make more sense if you needed fancier
editing with thousand separators, currency symbols, etc.
To just pad with zeros, it may be easier for the next guy to follow some
comments with zero padding then the edit APIs.
Just my .02,
Doug
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