Re: 5.3 unsigned fall-over?
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- Subject: Re: 5.3 unsigned fall-over?
- From: Dirk Laurie <dirk.laurie@...>
- Date: 2014年3月24日 07:07:58 +0200
2014年03月23日 21:09 GMT+02:00 Andrew Starks <andrew.starks@trms.com>:
> This question comes from ignorance and I'm sincerely curious:
>
> My understanding is that 5.3 internally flips to 64 bit signed when it sees
> that it's out of integer space in the double.
Well, let's test that,
$ lua53
Lua 5.3.0 (work2) Copyright (C) 1994-2014 Lua.org, PUC-Rio
> x=1 -- 64 bit signed
> for k=1,54 do x=2*x+1 end
> x%2
1
> x=1.0 -- double
> for k=1,54 do x=2*x+1 end
> x%2
0.0
So your understanding is wrong.