Floating Point Support

kt88seamp

I heard the prop has limited floating point support. I know passing parameters does not work, but what about something like this:

PUB SquareRoot | result, a

a := 2
result ^^= a

This in real life should return about 1.414. Does the prop store this as a floating point or does it round it to the nearest integer?

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Graham Stabler

It will only do a proper floating point square root on a constant assignment I think.

If you really need floating point functions you will need to use an object.

However if you just want to ensure you don't loose your 414 then just represent 2 as 2000 and your result will be 1414.

Graham

p.s. I think you have to do result := ^^a

Mike Green

The Propeller Tool does have floating point support, for constants and constant expressions only. There is an object in the Object Exchange that provides excellent single precision floating point support at run time, but the Propeller Tool does not generate code to call it. You have to write all floating point operations as function calls. You also have to write any floating point constants with a decimal point so the Propeller Tool knows they're floating point. There's a user's guide included in the download from the Object Exchange.