Re: The 4 negations of Lua

[Russell Haley <russ.haley@...>]

On Sun, Sep 18, 2016 at 1:01 AM, Russell Haley <russ.haley@gmail.com> wrote:
> On Sun, Sep 18, 2016 at 12:41 AM, Charles Heywood <vandor2012@gmail.com> wrote:
>> The latter. not evaluated first. You can read the manual to find precedence
>> documentation.
>
> https://www.lua.org/manual/5.3/manual.html#3.4.8
>
> Thank you for the RTFM, I get lazy sometimes and don't always find the
> manual helpful (better for reference than learning, I really should
> buy the new PIL).

Amazon just makes it too easy to buy things. Now I have to explain to
my wife where that 40 dollars went.  :D

Night,
Russ

> I was using the middle expression as an intermediate step for understanding:
>
> not 5 == 6 could also be explicitly expressed as  (not 5) == 6,
> which both evaluate to false == 6.
>
> would be more correct?
>
> Russ
>
>> On Sun, Sep 18, 2016, 2:27 AM Russell Haley <russ.haley@gmail.com> wrote:
>>>
>>> On Sun, Sep 18, 2016 at 12:04 AM, Sean Conner <sean@conman.org> wrote:
>>> > It was thus said that the Great Russell Haley once stated:
>>> >> On Fri, Sep 16, 2016 at 11:23 PM, Sean Conner <sean@conman.org> wrote:
>>> >> >
>>> >> >         not a == b
>>> >> >
>>> >> > is true if a is not equal to b.
>>> >>
>>> >> Hi Sean. My result differed (Lua prompt changed for inline formatting)
>>> >> :
>>> >>
>>> >> Lua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio
>>> >> % not 5 == 5
>>> >> false
>>> >> % not 5 == 6
>>> >> false
>>> >>
>>> >> %  not "Mary"=="Mary"
>>> >> false
>>> >> % not "Mary"=="mary"
>>> >> false
>>> >>
>>> >> This was run on FreeBSD 10.3
>>> >
>>> >   I got hosed by precedence (darn!  Should have tested these).  They are
>>> > being parsed as:
>>> >
>>> >         (not 5) == 5
>>> >
>>> > Try:
>>> >
>>> >         not (5 == 5)
>>> >         not (5 == 6)
>>>
>>> So does that mean I was seeing
>>>
>>> not 5 == 6 is equal to  (not 5) == 6  or false == 6?
>>>
>>> Thanks,
>>>
>>> Russ
>>>
>> --