LB Booster: GLOBAL in SUB isn't global

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Programming >> Compatibility with LB4 >> GLOBAL in SUB isn't global
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GLOBAL in SUB isn't global
Post by Dacite on Apr 26^th, 2015, 11:07pm

In LB4, you can declare a global variable in a SUB, but it doesn't work in LBB. It prints 0 in LBB, and 4294967295 in LB4. Something to be aware of...
Code:

call Init
print m32
END

SUB Init
  GLOBAL m32
  m32 = 2^32 - 1
END SUB

- Dacite

Re: GLOBAL in SUB isn't global
Post by Richard Russell on Apr 27^th, 2015, 06:23am

on Apr 26^th, 2015, 11:07pm, Dacite wrote:

Something to be aware of...

It would be something to be aware of, except that I cannot reproduce it! I copied your code, exactly as listed, into LBB v3.00, ran it, and it printed 4294967295. What do other people get?

Richard.

Re: GLOBAL in SUB isn't global
Post by Mal on Apr 27^th, 2015, 08:26am

I get the same as you, Richard.

Both gave the same answer.

If lines 5 and 6 are traded, different answers happen.
LBB stays the same; LB gives 0.

Code:

call Init
print m32
END

SUB Init
    m32 = 2^32 - 1
    GLOBAL m32
END SUB

Malcolm

Re: GLOBAL in SUB isn't global
Post by Dacite on Apr 27^th, 2015, 1:49pm

I'll be d**d - it works for me now too.

But it wasn't working - it was 0 in the later SUB when I was ANDing with it, and 0-ing out my array. The code worked right when I cut/pasted the declaration to the start of the code.

Note to self - In the future, restart LBB and see if the unexpected behavior goes away.

- Dacite

Re: GLOBAL in SUB isn't global
Post by tsh73 on Apr 27^th, 2015, 2:32pm

>>it was 0 in the later SUB when I was ANDing with it

Might it be not integer? LBB rounds to integer before using in logical operations (so sometimes to 0), if I am right.