[Gambas-user] Sin(Rad(180)) = ?

[Roberto Premoli]

On 16/04/21 16:00, vuott--- via User wrote:
> Hello,
> excuse me, if I'm not mistaken, the sine of 180° = 0.
> 
> https://en.wikipedia.org/wiki/Sine#Properties_relating_to_the_quadrants 
> <https://en.wikipedia.org/wiki/Sine#Properties_relating_to_the_quadrants>
> 
> But in Gambas with this:
> 
>     Sin(Rad(180.0))   I obtain: 1.22464679914735E-16
> 
> Why ?
> 
> Regards
> 
roundig error due to NOT ifinite precision of math processor.
do as follow:
parameter = 1000000
sine = (Int(parameter*Sin(Rad(180.0)))/parameter

this will workaround the problem.
tune "parameter" to fix precision in calculation