st: strange behavior of booleanfunctions in dialog if expressions

["Zurab Sajaia" <zsajaia@hotmail.com>]

Dear all,

I have encountered this problem in both Stata version 9.2 and 10 and not 
sure whether I'm doing something wrong or it's indeed strange.

The setup is as follows:
I have a (numeric) parameter entered by a user and before executing need to 
check it's values to be in some range... so something like this example:

VERSION 9

POSITION . . 300 300

DIALOG main
BEGIN
 EDIT ed_ed1  30 44 170        ., label("input") numonly
BUTTON bt_bt1 30 100 100 ., label ("button") onpush(program action)
END

PROGRAM action
BEGIN
 if main.ed_ed1.isle("0") {
  stopbox note "true"
  exit
 }
 stopbox note "false"
END

I have here -isle- function but same happens with -islt-, -isgt-, and -isge- 
as well.  The problem arises with numbers (-1, 1), if I put them with 
leading 0 (like 0.9 or -0.3) everything looks fine but if I put .9 or -.3 
instead then -islt- and -isle- give wrong answer for positive fractions 
and -isgt- and -isge- make mistakes with negatives.

Does anyone have experienced something similar?

any thoughts would be appreciated.
Zurab


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