8.20 - 8.00 = 0.199999999999999

[level20peon]

I am trying to do a simple substraction in AutoIT. Turned out to be rocket-science.

Send("^c")
$test = clipget()
$varIN = StringReplace($test,",",".")
$varOUT = number($varIN)
$result = ($varOUT - "8.00")
MsgBox(0,"result",$result)

I am copying a string to the clipboard "8,00", replace the "," by "." and convert it into a number afterwards. In fact $varOUT returns "8.20", but $varOUT - 8.00 returns 0.199999999999999. What am I missing ?

[foster74]

Very strange, even Execute() doesn't help. Maybe use Round() for the time being?

[Malkey]

I am trying to do a simple substraction in AutoIT. Turned out to be rocket-science.

Send("^c")
$test = clipget()
$varIN = StringReplace($test,",",".")
$varOUT = number($varIN)
$result = ($varOUT - "8.00")
MsgBox(0,"result",$result)

I am copying a string to the clipboard "8,00", replace the "," by "." and convert it into a number afterwards. In fact $varOUT returns "8.20", but $varOUT - 8.00 returns 0.199999999999999. What am I missing ?

You have discovered the floating point problem.

See

http://www.autoitscript.com/forum/index.ph...st&p=673030

and

http://www.autoitscript.com/forum/index.ph...st&p=611629

$result = round($varOUT - "8.00",14)

works.

[level20peon]

Thanks, didn't come up when I searched the forum for math functions.

[Richard Robertson]

The problem isn't directly related to AutoIt. All programs that use floating point arithmetic suffer from this.