Re: Array as a field name?

[Jim Langston <jimlangston@xxxxxxxxxxxxxxxx>]

Question:

It would seem to me that he could use either Overlay or a basing pointer
to do the exact same thing, correct?

Which is the more "correct" way to do it?  I would be apt to use a basing
pointer to an array and point it to MONTH01, but does Overlay have some
advantage, even if it is easier to maintain.

Regards,

Jim Langston

Me transmitte sursum, Caledoni!

John Taylor wrote:
> 
> Frank,
> 
> You can try this:
> 
>       * Redefine the field names from your file as a data structure
>      D MonthsDS        DS
>      D  MONTH01
>      D  MONTH02
>      D  MONTH03
>      D  MONTH04
>      D  MONTH05
>      D  MONTH06
>      D  MONTH07
>      D  MONTH08
>      D  MONTH09
>      D  MONTH10
>      D  MONTH11
>      D  MONTH12
>       *
>       * Then define an array that overlays the data structure
>      D  MthsAry                            Like(MONTH01) Dim(12)
>      D                                     Overlay( MonthsDS )
>       *
>       *
>       * Now you can access each field as an array element, or by name
>      C                   Eval      MONTH01    = 1
>      C                   Eval      MthsAry(1) = 1
> 
> John Taylor
> Canada
> 
> ----- Original Message -----
> From: "Frank Kany" <frank.kany@hanoverfoods.com>
> To: "RPG Mailing List (E-mail)" <RPG400-L@midrange.com>
> Sent: Monday, May 14, 2001 15:07
> Subject: Array as a field name?
> 
> > I have a file that has a field for each month of the year(each field holds
> > the amount of pallets used that month).
> >
> > FILE:  MONTHTOTAL
> >
> >       A          R RECORD                   PFILE(FLDREF)
> >       A             CUSNO
> >       A             MONTH01
> >       A             MONTH02
> >       A             MONTH03
> >       A             MONTH04
> >       A             MONTH05
> >       A             MONTH06
> >       A             MONTH07
> >       A             MONTH08
> >       A             MONTH09
> >       A             MONTH10
> >       A             MONTH11
> >       A             MONTH12
> >       A         K  CUSNO
> >
> > When pallets get added or subtracted from the warehouse I want to update
> > this file.  Since this is May(MONTH05), I would like to update only field
> > 'MONTH05' with the correct data.
> >
> > Is there a way to use an array as a field name?
> > example:
> >  *
> >  * Array Index
> > D X               S              2P 0
> >   *
> >   * Save Current Month into a work field
> >  C                   MOVEL     UDATE         X              2 0
> >  *
> >  * Update HBI Customer Master Extension File
> > C     CUSNO         SETLL     MONTHTOT
> > C     CUSNO         CHAIN     MONTHTOT                           90
> >  *
> >  * Record Found; Update File Field
> > C     *IN90         IFEQ      *OFF
> > C                     EVAL              MONTH(X)  = CURTOTAL
> > C                     ENDIF
> >
> > Thank you,
> >
> > Frank Kany
+---
| This is the RPG/400 Mailing List!
| To submit a new message, send your mail to RPG400-L@midrange.com.
| To subscribe to this list send email to RPG400-L-SUB@midrange.com.
| To unsubscribe from this list send email to RPG400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---