From: Alan Braslau <braslau.list@comcast.net>
To: Pablo Rodriguez <oinos@gmx.es>
Cc: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: integer displayed as .0 float in Lua-5.3
Date: Thu, 9 Aug 2018 13:34:45 -0600 [thread overview]
Message-ID: <20180809133445.21edeaa1@comcast.net> (raw)
In-Reply-To: <4f671b52-7a2d-ddb6-7272-4173f24b4936@gmx.es>
The lua manual also states that one should NOT rely on the implicit conversion of a string to its numerical value, and suggests the systematic use of tonumber().
Alan
On Thu, 9 Aug 2018 21:20:54 +0200
Pablo Rodriguez <oinos@gmx.es> wrote:
> On 08/09/2018 08:12 PM, Wolfgang Schuster wrote:
> > Use tonumber.
>
> Many thanks for your reply, Wolfgang.
>
> The issue is in Lua itself:
>
> print(5+"5")
>
> In versions prior to 5.3, result is "10".
>
> From version 5.3, result is "10.0",
>
> I would say this might be a bug. According to the “Lua 5.3 Reference
> Manual" (https://www.lua.org/manual/5.3/manual.html#3.1):
>
> A numeric constant with a radix point or an exponent denotes a
> float; otherwise, if its value fits in an integer, it denotes an
> integer.
>
> Well, "10.0" contains the radix point, but with no arithmetical relevance.
>
> My background is in humanities and I don’t understand the exponent for
> being a float ("10²" contains an exponent
> [https://www.m-w.com/dictionary/exponent], but I would say is an integer
> in all possible worlds [or all the worlds I know ]).
>
> Could anyone explain me what am I missing here or confirm whether this
> is a bug?
>
> Many thanks for your help,
>
> Pablo
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next prev parent reply other threads:[~2018-08-09 19:34 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 [this message]
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
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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