BUG!!!???? in QBASIC 1

[Pappy1942]

Hi,

On another board I came across post about an overflow error that came up in a long program.

I reduced it to this

REM TEST
A& = 40000 REM NO OVERFLOW ( & indicates LONG)
A& = 4 * 10000 REM OVERFLOW


Has any one seen this? Is there a work around? Why does it happen?

Pappy

 

[dpaulson]

A& = 4 * 10000& 'no overflow

David Paulson

 

[dpaulson]

I think why it produces an error is that the 4 and the 10000 are treated as integers (because there is not declaration on them) which will produce an integer out of range. This calcualtion is done before it is assigned to the long variable 'a&'. With the 10000 declared as a long it does not produce the error.
David Paulson

 

[Pappy1942]

Hi,

I also found that

tenthou = 10000
a& = (4 * tenthou)

worked.

In M$ parlance this isn't a BUG it's a FEATURE.

Pappy

BTW Thanks for the quick responce.

 

[MiggyD]

Pappy1942:

Just a quick note (pun intended)

By using "tenthou" and NOT HAVING A NUMERIC DEFINITION (ex: defint A-Z), QB is set to default to SINGLE numerical definition.


------------------------------
If you have QB 4.5 or better test this out:

[red]'write this to your screen
tenthou = 10000[/red]

then move the cursor to TENTHOU and press F1, when you're done press ESC key.


-------------------------------
then add this before that line:

[red]DEFINT T[/red]

then move the cursor to TENTHOU and press F1, when you're done press ESC key.


see what I mean?

--MiggyD