[Gambas-user] Bug with * operator (I think)

[Benoît Minisini]

> Hi!
> I'm using Gambas 3 rev 2822 @ Ubuntu 9.10 64bit.
> 
> To IDE console;
> 
> ?3413156131^2
> 1.164963477458E+19
> Right.
> 
> ?3413156131*3413156131
> -6797109299126662455
> Wrong.
> 
> 
> Or in code;
> 
> dim y as long = 3413156131
> Print (y * (1 + y)) / 2
> 
> Result;
> -3398554647856753152
> Wrong.

The '*' operator (like '+' and '-') returns the same datatype as its 
arguments. There is no conversion to a bigger datatype if needed, so the 
result is truncated.

> 
> 
> Also, is there possibility to define integer variable bigger than 64bit?

No.

> I need really big numbers...

Find a volunteer to implement a Gambas component based on a library that can 
manage big integers, like that one: http://gmplib.org/

Regards,

-- 
Benoît Minisini