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- Subject: Re: [ANN] Lua 5.3.0 (rc1) now available
- From: Douglas Davenport <puzzlery@...>
- Date: Thu, 18 Dec 2014 09:52:40 -0500
On Dec 18, 2014, at 7:40 AM, Roberto Ierusalimschy <firstname.lastname@example.org> wrote:
>>> As this point has come up several times, I have a quick quiz for this
>>> list. Without running the code, what are the results of the following
>>> expressions in Lua 5.2?
>>> string.rep("a", 2.7)
>>> string.format("%d", 2.7)
>>> string.rep("a", 2.3)
>>> string.format("%d", 2.3)
>> Undefined, Undefined, Undefined, Undefined, or with GCC, "aaa", "3",
>> "aa", "2" (pretty sure GCC rounds properly? I may be wrong)
>> About the quiz, in version 5.2, I believe that all values are considered
>> equal to 2.
>> IIRC, in practice, lua always rounds down. so:
> "Undefined" is correct according to the manual, but (unlike 5.3) the
> implementation thinks otherwise. And none of these answers match what my
> machine (an ordinary Pentium/Linux) does. Anyone else want to try an
> -- Roberto
> -- Roberto
I also thought the answer Daurnimator posted was correct. I tried it with 5.1, 5.2 and 5.3 (beta). With 5.1 and 5.2 I get the result I expected:
And, as expected on 5.3 (beta), I got the error "(number has no integer representation)” on all four expressions.
I am running on OS X 10.9, in case is make a difference to someone.
(Yes, I know I need to update my 5.3 to rc1...