From: Arthur Reutenauer <arthur.reutenauer@normalesup.org>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: integer displayed as .0 float in Lua-5.3
Date: Sun, 12 Aug 2018 10:44:28 -0400 [thread overview]
Message-ID: <20180812144428.GB2528403@phare.normalesup.org> (raw)
In-Reply-To: <7ff3c6bd-a052-1f92-fd88-c551e9926e7f@gmx.es>
On Sat, Aug 11, 2018 at 11:29:41AM +0200, Pablo Rodriguez wrote:
> I realize that the fault is mine, but with backwards compatibility I
> meant that the same operation (10 + "10") gives different results with
> different Lua versions.
It doesn’t, it returns 10 in both cases. The difference is in the
behaviour of the print function. Try
print(10.0)
in Lua 5.2 and 5.3: the former prints 10, the latter 10.0. That is
consistent with the part of the specification you quote in another
email: in Lua >= 5.3, a number with a decimal point in it is always
interpreted as a float. If the number to be printed is the result of
some computation, however (instead of lexical analysis), a choice needs
to be made: that is where the change occurred, since in Lua 5.2 print
displayed the shortest possible representation, while in Lua 5.3 it
chose to interpret the number as a float. It’s a reasonable choice and
breaking compatibility for an elementary function such a print is to be
expected when such a change in the language occurred; even desirable, in
my opinion.
Best,
Arthur
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next prev parent reply other threads:[~2018-08-12 14:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-09 18:02 Pablo Rodriguez
2018-08-09 18:12 ` Wolfgang Schuster
2018-08-09 19:20 ` Pablo Rodriguez
2018-08-09 19:34 ` Alan Braslau
2018-08-09 20:00 ` Pablo Rodriguez
2018-08-09 20:16 ` Alan Braslau
2018-08-11 9:29 ` Pablo Rodriguez
2018-08-11 17:55 ` Alan Braslau
2018-08-12 14:44 ` Arthur Reutenauer [this message]
2018-08-09 20:25 ` Hans Hagen
2018-08-11 10:05 ` Pablo Rodriguez
2018-08-09 20:20 ` Hans Åberg
2018-08-11 9:33 ` Pablo Rodriguez
2018-08-11 12:21 ` Hans Åberg
2018-08-12 7:49 ` Hans Hagen
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