Apologies if this is common knowledge, but I've just come across a huge maths problem in Flash... as I've mentioned before I'm working on an online trading system where real people make or lose real money, sometimes a huge amount of it, so this isn't funny...

You are right. It's very not funny.

Here's one solution that might be useful to you...

correctThis = function(thisNumber:Number,thesePlaces:Number):Number{
        var temp:Number = Math.pow(10,thesePlaces);
        return Math.round(thisNumber * temp) / temp;
}

var a:Number = 171.9;
var b:Number = 172.2;
var c:Number;
trace(correctThis(b - a,2));

...0.3

Cheers

David

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