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- Subject: Re: Overflow of hex vs decimal integer literals
- From: Roberto Ierusalimschy <roberto@...>
- Date: Thu, 23 Feb 2017 10:30:06 -0300
> TIL that hex literals don't overflow into floats:
TIL what TIL means :-)
> Lua 5.3.4 Copyright (C) 1994-2017 Lua.org, PUC-Rio
> > 0x7fffffffffffffff
> 9223372036854775807
> > 0x7ffffffffffffffff
> -1
> > 0x7fffffffffffffffff
> -1
> > 0x2222222222222222
> 2459565876494606882
> > math.type(0x2222222222222222)
> integer
> > 0x22222222222222222
> 2459565876494606882
> > math.type(0x22222222222222222)
> integer
>
> vs decimals:
>
> > 9223372036854775807
> 9223372036854775807
> > math.type(9223372036854775807)
> integer
> > 9223372036854775808
> 9.2233720368548e+18
> > math.type(9223372036854775808)
> float
This is by design. As we are still playing with the exact behavior
of overflows in constants, we prefer not to fix it in the documentation
now. (This changed between releases of 5.3.)
-- Roberto
