[email protected] wrote:
> I came across this if condition and it goes to else part,
>
> VAR.1 = "."
>
> IF VAR.1 THEN
> CRT "IF PASS"
> END ELSE
> CRT "IF FAIL"
> END
>
> And the jbase release info.,
> RELEASE Information : Major 5.0 , Minor 5 , Patch 0132 (Change
> 54733)
>
>
>
This basically a function of the legacy system that jBASE is emulating
and is, in this case, related to what a '.' means and why this form of
expression of evaluation should not have been provided by UniVerse. It
was obviously an attempt by someone at some point to try and act like
other languages in terms of
The '.' is being seen as a numeric value in this operation and I think
that it will evaluate to 0, the zero is then taken to mean false. You
are much better off using an expression that qualifies what you mean by
TRUE and FALSE as all good programming books will explain to you. For
instance in C, when you write
int i =0
if (i) { ... }
It only works because the compiler infers the semantics and not because
0 means false. You should really write:
if (i != 0) { ... }
Similarly, and perhaps even more so, in jBC you should not use
IF VAR.1
as you will get into messes like your observation. In jBC, unlike C, the
compiler cannot infer the semantics in all cases but must rely on
runtime type conversions, hence it is likely to be 'wrong' in some
cases. It isn't wrong of course, it is just that the behavioral
semantics of what a '.' means are screwed up by a bug in numeric
evaluation that must be propagated by jBASE or all sorts of other badly
formed logical expressions would not work like they used to on UniVerse
(or whatever).
Change the expression to one that unambiguously yields a logical true or
false, which is good coding practice anyway. In this case perhaps even
your return value should change to something unambiguous, but I suspect
that here you have just posted a summary example of a large picture.
Generally this problem has to become:
IF var1 != ""
or IF var1 = 0
Or something similar.
Jim
> >
>
--~--~---------~--~----~------------~-------~--~----~
Please read the posting guidelines at:
http://groups.google.com/group/jBASE/web/Posting%20Guidelines
IMPORTANT: Type T24: at the start of the subject line for questions specific to
Globus/T24
To post, send email to [email protected]
To unsubscribe, send email to [email protected]
For more options, visit this group at http://groups.google.com/group/jBASE?hl=en
-~----------~----~----~----~------~----~------~--~---
