Re: Incrementing Character Fields

[Carsten Flensburg <novasol@xxxxxxxxxxxx>]

DAsmussen@aol.com wrote:
> 
> 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?
> 

Hey Dean,

Here's yet another way of accomplishing the task:

     D Field           S              1a   Dim( 3 )
     D Len             S              5u 0 Inz( %Size( Field: *All ))
     D Idx             S              5u 0
     **
     D Cur             C                   ' ABCDEFGHIJKLMNOPQRSTUVWXYZ'
     D Nxt             C                   'ABCDEFGHIJKLMNOPQRSTUVWXYZA'
     **
     C                   Eval      Idx        =  Len
     **
     C                   Do        Len
     C     Cur:Nxt       Xlate     Field(Idx)    Field(Idx)
     **
     C                   If        Field(Idx) <> 'A'
     C                   Leave
     **
     C                   Else
     C                   Eval      Idx        =  Idx - 1
     C                   EndIf
     C                   EndDo
     **
     C                   Return

Both blanks and overflow ('ZZZ' + 1) gives the result 'AAA'

Best regards,
Carsten Flensburg

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