RE: [Flashcoders] Flash cant add up!!
It's a simple rounding error between floating point and binary numbers, and apparent in most (all?) programming languages. Here's a good explanation from the Python manuakl: http://docs.python.org/tut/node16.html Peter Blumenthal Software Development Manager Pearson Education 80 Strand, London, WC2R 0RL Direct Line: +44 (0) 20 7010 2806 Switchboard: +44 (0) 20 7010 2900 > > anyone have any idea why flash does this??? > ___ This email may contain confidential material. If you were not an intended recipient, please notify the sender and delete all copies. We may monitor email to and from our network. ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] Flash cant add up!!
oaky great cheers :D On 09/08/06, Michael Kneib <[EMAIL PROTECTED]> wrote: http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_13989 Am Mi, 9.08.2006, 16:46, schrieb mike cann: > Okay, i may be going crazy but slap this on frame one of a flash file and > observe the output: > >... > > so the res value continues on like that being 0.0996 rather > than 0.1.. > > ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] Flash cant add up!!
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_13989 Am Mi, 9.08.2006, 16:46, schrieb mike cann: > Okay, i may be going crazy but slap this on frame one of a flash file and > observe the output: > >... > > so the res value continues on like that being 0.0996 rather > than 0.1.. > > ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
[Flashcoders] Flash cant add up!!
Okay, i may be going crazy but slap this on frame one of a flash file and
observe the output:
//
var incrementNum:Number = 0;
var oldNum:Number = 0;
var resultNum:Number =0;
onEnterFrame = function(){gogo();}
function gogo()
{
oldNum = incrementNum;
incrementNum += 0.1;
resultNum = incrementNum - oldNum;
trace("old: "+oldNum);
trace("inc: "+incrementNum);
trace("res: "+resultNum);
trace("");
}
stop();
//
For those who dont have the time to test it the output follows like this:
//
old: 0
inc: 0.1
res: 0.1
old: 0.1
inc: 0.2
res: 0.1
old: 0.2
inc: 0.3
res: 0.1
old: 0.3
inc: 0.4
res: 0.1
old: 0.4
inc: 0.5
res: 0.1
old: 0.5
inc: 0.6
res: 0.1
old: 0.6
inc: 0.7
res: 0.1
old: 0.7
inc: 0.8
res: 0.1
old: 0.8
inc: 0.9
res: 0.1
old: 0.9
inc: 1
res: 0.1
old: 1
inc: 1.1
res: 0.1
old: 1.1
inc: 1.2
res: 0.1
old: 1.2
inc: 1.3
res: 0.1
old: 1.3
inc: 1.4
res: 0.1
old: 1.4
inc: 1.5
res: 0.1
old: 1.5
inc: 1.6
res: 0.1
old: 1.6
inc: 1.7
res: 0.1
old: 1.7
inc: 1.8
res: 0.1
old: 1.8
inc: 1.9
res: 0.1
old: 1.9
inc: 2
res: 0.0999
old: 2
inc: 2.1
res: 0.1
old: 2.1
inc: 2.2
res: 0.1
old: 2.2
inc: 2.3
res: 0.1
old: 2.3
inc: 2.4
res: 0.1
old: 2.4
inc: 2.5
res: 0.1
old: 2.5
inc: 2.6
res: 0.1
old: 2.6
inc: 2.7
res: 0.1
old: 2.7
inc: 2.8
res: 0.1
old: 2.8
inc: 2.9
res: 0.1
old: 2.9
inc: 3
res: 0.1
old: 3
inc: 3.1
res: 0.1
old: 3.1
inc: 3.2
res: 0.1
old: 3.2
inc: 3.3
res: 0.1
old: 3.3
inc: 3.4
res: 0.1
old: 3.4
inc: 3.5
res: 0.1
old: 3.5
inc: 3.6
res: 0.1
old: 3.6
inc: 3.7
res: 0.1
old: 3.7
inc: 3.8
res: 0.1
old: 3.8
inc: 3.9
res: 0.1
old: 3.9
inc: 4
res: 0.0996
old: 4
inc: 4.1
res: 0.0996
old: 4.1
inc: 4.2
res: 0.0996
old: 4.2
inc: 4.3
res: 0.0996
old: 4.3
inc: 4.4
res: 0.0996
old: 4.4
inc: 4.5
res: 0.0996
old: 4.5
inc: 4.6
res: 0.0996
old: 4.6
inc: 4.7
res: 0.0996
old: 4.7
inc: 4.8
res: 0.0996
old: 4.8
inc: 4.9
res: 0.0996
old: 4.9
inc: 5
res: 0.0996
old: 5
inc: 5.1
res: 0.0996
old: 5.1
inc: 5.2
res: 0.0996
//
so the res value continues on like that being 0.0996 rather than
0.1..
anyone have any idea why flash does this???
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