AW: TESTN

["HauserSSS" <Hauser@xxxxxxxxxxxxxxx>]

But be aware, if your character field contains only *Blanks,
the built-in-functions %INT() and %DEC() will not return *Zeros, but fail.

Birgitta

-----Ursprungliche Nachricht-----
Von: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]Im Auftrag von Scott Klement
Gesendet: Montag, 14. Februar 2005 20:44
An: RPG programming on the AS400 / iSeries
Betreff: Re: TESTN


>     c                   evalr     pay_type_test = paytyp
>     c                   testn                   pay_type_test          99
>     c                   if        *in99
>     c                   eval      sctax# = %int(paytyp)
>     c                   else
>     c                   eval      msgdata = 'Invalid Transaction Type

TESTN is designed to validate a numeric field before using MOVE or a data 
structure to convert it to a number.  TESTN considers many letters to be 
"valid numbers" because they'd fit in the negative sign zone of a zoned 
decimal field.

Trouble is -- you're not converting it to a zoned decimal field using 
MOVE.  You're converting it to an INTEGER field using %INT()!!

Instead of using TESTN, use MONITOR.  It's designed for exactly what 
you're trying to do:

      c                   monitor
      c                   eval      sctax# = %int(paytyp)
      c                   on-error
      c                   eval      msgdata = 'Invalid Transaction Type'
      c                   endmon

Some people will tell you to use %check(), but IMHO this is incorrect. 
For example, consider the string '  -1234'.  This is a completely valid 
number for interpretation by %int() but it won't work if you validate it 
with %check('0123456789':myvar) because it contains both blanks and the 
negative sign.  If you used %check('0123456790- ':myvar), then it would 
think that strings like '-------' or '- - - -' are valid numbers!

So, use MONITOR.  If you expect a TON of errors, use %check() first to 
weed a lot of them out before using MONITOR, but still use MONITOR...

Good luck!



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