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
