RE: Incrementing Character Fields

Here's a subprocedure I have in my strings service program.  It works
similar to what your asking for, and uses recursion.  It has worked slick
for me.

 <<IncChar.txt>> 

Bradley V. Stone
Taylor Corporation - OASIS Programmer/Analyst   
bvstone@taylorcorp.com


> -----Original Message-----
> From: Joel Fritz [SMTP:JFritz@sharperimage.com]
> Sent: Thursday, April 15, 1999 3:04 PM
> To:   'MIDRANGE-L@midrange.com'
> Subject:      RE: Incrementing Character Fields
> 
> I'm sure there's a more elegant way of doing this, but here's a brute
> force
> method:
> 
> Load an array with the alphabet.
> 
> Look at the rightmost character in the field you want to increment
>       If it's less than 'Z'
>               look it up in the alphabet and replace it with the next
> character
>               you're done     
>                       else
>                               replace it with 'A' and repeat the above one
> character to the left 'til you've either
>                               encountered total overflow or you're done.  
> 
> I've skipped the parts where you could check for invalid characters and
> 'ZZZ'
> 
> Don't like the LOKUP or LOOKUP much, but it's only over a 26 element array
> and that seems fast enough.  Not enough elements for a bsearch.
> -----Original Message-----
> From: DAsmussen@aol.com [mailto:DAsmussen@aol.com]
> Sent: Thursday, April 15, 1999 11:24 AM
> To: midrange-l@midrange.com
> Subject: Incrementing Character Fields
> 
> 
> Hey Folks,
> 
> Here's an interesting exercise!  I'd swear that I've seen this done in RPG
> 
> many moons ago, but the only practical example I can recall is from a long
> 
> dead platform using an equally long dead version of BASIC.  Say you have a
> 
> three character alpha field that needs to be incremented progressively
> like
> a 
> number (e.g., AAA, AAB, AAC...ABA, ABB, ABC...ZZX, ZZY, ZZZ).  Any ideas
> on 
> how this could be done in either RPG or RPGLE?
> 
> TIA,
> 
> Dean Asmussen
> Enterprise Systems Consulting, Inc.
> Fuquay-Varina, NC  USA
> E-mail:  DAsmussen@aol.com
> 
> "The brain is a wonderful organ.  It starts the moment you get up and
> doesn't 
> stop until you get into the office." -- Robert Frost
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      *//////////////////////////////////////////////////////////////*
      * (#IncChar) Increment Character                               *
      *//////////////////////////////////////////////////////////////*
     P #IncChar        B                   EXPORT
      *--------------------------------------------------------------*
     D #IncChar        PI           256
     D  text                        256    VALUE
     D  size                          3  0 VALUE
      *
     D C1              C                   CONST('ABCDEFGHIJKLMNOPQRSTUVWXYZ012-
     D                                            3456789')
     D C2              C                   CONST('BCDEFGHIJKLMNOPQRSTUVWXYZA123-
     D                                            4567890')
      *
     D LoValC          C                   CONST('A')
     D LoValN          C                   CONST('0')
      *
     D NewText         S                   LIKE(text)
     D NewSize         S                   LIKE(size)
      *
     D CurChar         S              1
     D LoVal           S              1
      *--------------------------------------------------------------*
     C                   if        (text = ' ')
     C                   eval      size = 1
     C                   endif
      *
     C                   eval      CurChar = %subst(text:size:1)
     C                   TESTN                   CurChar              99
      *
     C                   if        (*IN99)
     C                   eval      Loval = LovalN
     C                   else
     C                   eval      LoVal = LoValC
     C                   endif
      *
     C     C1:C2         XLATE     CurChar       CurChar
      *
     C                   eval      %subst(text:size:1) = CurChar
      *
     C                   if        (CurChar = LoVal) and (size > 1)
     C                   eval      NewSize = (size - 1)
     C                   eval      NewText = (%subst(text:1:NewSize))
     C                   eval      %subst(text:1:NewSize) =
     C                               #IncChar(NewText:NewSize)
     C                   endif
      *
     C                   RETURN    text
      *--------------------------------------------------------------*
     P #IncChar        E