Tip

Get rid of padded zeros in your e-business apps

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Here is an easy way to convert numeric fields to alpha fields when working with data presented to the Web, spreadsheets, text files or other databases where padded zeros become a nuisance. Just use the CHECK opcode and substring the field equal to it, starting at the result of your check operation. A couple of things to remember:

1. Don't forget to check for your index returning a zero if the numeric field is full.

2. If you use free format RPG, you would want to use the %check bif. Also, this code could easily be written in a procedure with variable length fields to handle all of your data conversion needs.


 
  
D @Number      S        9  0
D @Alpha       S        9
D x            S        3  0

C         move   @Number  @Alpha 
C   ' 0'  check  @Alpha   x
C         if     x > *zero
C         eval   @Alpha = %subst(@Alpha:x)
C         else
C         eval   @Alpha = '0'
C         endif  

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USER FEEDBACK TO THIS TIP

  • This tip does not handle negative numbers correctly. For example, if @Number = -2, @Alpha = 'K'. Not exactly what the spreadsheet user was expecting. RPG already has a BIF for this task: %Char. It will also correctly display a number with decimal places. Why reinvent the wheel? Example: C Eval @Alpha = %Char(@Number) %Char does a good job of formatting numeric, date, time, and timestamp data. If you require more precise control, you can use the %Editc of %Editw BIFs. Example: C Eval @Alpha = %Triml(%Editc(@Number : 'J')) -- Nick Hobson

This was first published in January 2002

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