Floating point variables

Michael Monschau michael at brainydata.co.uk
Sun Apr 25 21:30:51 UTC 2021

Hi Bastiaan,

A bit of a late response. I have not been monitoring the list for a while as I have been very busy. Was just going through two weeks worth of messages and came across this.
Internally, at c++ level, all floating point arithmetic uses the Omnis qreal type which is defined either as a a double or long double, depending on the compilation. 

When I compile a component on the Mac, sizeof(qreal) returns 8, so it is compiled with qreal as a 8 byte double. 
I suspect this is true on Windows also. 

Consequently, any Omnis variable type that is floating point will operate at that level of accuracy, as far as I am aware. Specifying different dp only alters the final display of the value when converting from floating point to string.

Kind regards,

Brainy Data Limited
The Home for Omnis components
Web: www.brainydata.com
GitHub: https://github.com/BrainyData

> On 14 Apr 2021, at 05:18, Bastiaan Olij <bastiaan at muxworks.com.au> wrote:
> Hey All,
> Does anyone know if there is some info about how Omnis handles floating point variables behind the scenes? Mainly the 5d, 10dp, etc variants?
> It looks like a normal floating point variable is just a standard 32bit float? It seems to be the fixed variants have a higher precision level.
> -- 
> Kindest Regards,
> Bastiaan Olij
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