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- Subject: Re: Definion of 'for' statement in the manual
- From: Roberto Ierusalimschy <roberto@...>
- Date: Sat, 26 Sep 2015 15:32:17 -0300
> >> Why does Lua 5.3's reference does "var = var - step" instead of simply
> >> moving the "var = var + step" after "block" (as in Lua 5.2)?
> > This is how it is implemented, and both ways can give different results.
> > (That it is why we do not like to specify things with code, it gives too
> > much details that should be left open.)
> How could both ways give different results?
Floating point operations. See the next example:
> for i = -2^53, -2^53 + 2 do print(string.format("%.0f", i)) end
(Note that the given initial value, -2^53, is -9007199254740992.)