Re: Lua 5.3 precedence issue

[Pierpaolo Bernardi <olopierpa@...>]

What is the issue? Can you be more explicit?


On Sat, Jan 17, 2015 at 9:17 AM, Dmitry V. Zaitsev <hhrhhr@gmail.com> wrote:
> from manual:
>
>> Operator precedence in Lua follows the table below, from lower to higher
>> priority:
>> [[cut]]
>>      <<    >>
>>      ..
>>      +     -
>>      *     /     //    %
>> [[cut]]
>
>
> test example with wrong result:
>
>> Lua 5.3.0  Copyright (C) 1994-2015 Lua.org, PUC-Rio
>> > i = 0
>> > i = i + 1 * 1 << 8
>> > print(i)
>> 256
>> > i = i + 1 * 1 << 16
>> > print(i)
>> 16842752
>> > i = i + 1 * 1 << 24
>> > print(i)
>> 282574505115648
>
>
> but with braces all ok:
>
>> Lua 5.3.0  Copyright (C) 1994-2015 Lua.org, PUC-Rio
>> > i = 0
>> > i = i + 1 * (1 << 8)
>> > print(i)
>> 256
>> > i = i + 1 * (1 << 16)
>> > print(i)
>> 65792
>> > i = i + 1 * (1 << 24)
>> > print(i)
>> 16843008