Re: 5.3 unsigned fall-over?

[Andrew Starks <andrew.starks@...>]

On Sunday, March 23, 2014, Raphael Lydia Bertoche <rbertoche@cpti.cetuc.puc-rio.br> wrote:

This wont apply for double. Now Integers won't become double anymore, loosing precision. They may only overflow.
Lua 5.3.0 (work2)  Copyright (C) 1994-2014 Lua.org, PUC-Rio
> 1000*1000*1000*1000*1000*1000
1000000000000000000
> 1000*1000*1000*1000*1000*1000*10
-8446744073709551616
> 1000*1000*1000*1000*1000*1000*100
7766279631452241920
> 1000*1000*1000*1000*1000*1000*100.0
1e+20

Lua 5.2.3  Copyright (C) 1994-2013 Lua.org, PUC-Rio
> =1000*1000*1000*1000*1000*1000
1e+18
> =1000*1000*1000*1000*1000
1e+15
> =1000*1000*1000*1000
1000000000000

That makes sense. As an interim value, the overflow helps, for one round. Then, of course, it doesn't and flipping back to float is best. 

I take it that trapping overflow unsigned int and going to float is more difficult than it's worth?