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Chad

Math errors in AutioIT?

4 posts in this topic

I was never too great at math but...

$test = 0
 
While 1
     $test += .01
     ConsoleWrite($test & @LF)
     If $test = 100 Then ExitLoop
WEnd
 
Exit

...should be fairly straightforward and get us to 100 in equal steps of .01, yes? However the output gives me numbers such as 0.810000000000001. This throws off the whole sequence and somehow never reaches exactly 100 (99.9900000000142, 100.000000000014, etc.).

The script has no purpose other than my learning that $var += n is another way to express $var = $var + n. I just happened to notice that neither expressions give me the sequence I had expected.

Any help is appreciated. I'm using the latest version.

Best,

Chad

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This works >>

Global $iNumber = 0

While 1
    $iNumber = Round($iNumber + 0.01, 2)
    ConsoleWrite($iNumber & @LF)
    If $iNumber = 100 Then
        ExitLoop
    EndIf
WEnd
Exit

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Updated: 04/09/2015

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Chad,

Google "floating point arithmetic" and you will find out more about this problem than you ever wished to know. ;)

It happens because of the way floating point numbers are stored and affects all software not just AutoIt. :graduated:

M23

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Something new every day. :graduated:

Thank you both for the informative answers/solutions.

Regards,

Chad

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