Simple number formula with unexpected results

[laffo16]

for some reason which is beyond me, i seem to be getting incorrect results from this formula

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Global $odds_arr[1000]
    $COA_num = 1.00
    $COA_int = 0
    While 1
        $COA_int += 1
        If $COA_num >= 1.00 And $COA_num < 2 Then
            $COA_num += 0.01
        ElseIf $COA_num >= 2.00 And $COA_num < 3 Then
            $COA_num += 0.02
        ElseIf $COA_num >= 3.00 And $COA_num < 4 Then
            $COA_num += 0.05
        ElseIf $COA_num >= 4.00 And $COA_num < 6 Then
            $COA_num += 0.10
        ElseIf $COA_num >= 6.00 And $COA_num < 10 Then
            $COA_num += 0.20
        ElseIf $COA_num >= 10.00 And $COA_num < 20 Then
            $COA_num += 0.50
        ElseIf $COA_num >= 20.00 And $COA_num < 30 Then
            $COA_num += 1.00
        ElseIf $COA_num >= 30.00 And $COA_num < 50 Then
            $COA_num += 2.00
        ElseIf $COA_num >= 50.00 And $COA_num < 100 Then
            $COA_num += 5.00
        ElseIf $COA_num >= 100.00 And $COA_num < 1000 Then
            $COA_num += 10.00
        EndIf
        $odds_arr[$COA_int] = $COA_num
        If $COA_num >= 1000 Then
            ExitLoop
        EndIf
        ToolTip($COA_num, 0, 0)
    WEnd
    $odds_arr[$COA_int+1] = 0
    _ArrayDisplay($odds_arr, "")oÝ÷ Û
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Edited April 10, 2009 by laffo16

[martin]

for some reason which is beyond me, i seem to be getting incorrect results from this formula

expandcollapse popup

Global $odds_arr[1000]
    $COA_num = 1.00
    $COA_int = 0
    While 1
        $COA_int += 1
        If $COA_num >= 1.00 And $COA_num < 2 Then
            $COA_num += 0.01
        ElseIf $COA_num >= 2.00 And $COA_num < 3 Then
            $COA_num += 0.02
        ElseIf $COA_num >= 3.00 And $COA_num < 4 Then
            $COA_num += 0.05
        ElseIf $COA_num >= 4.00 And $COA_num < 6 Then
            $COA_num += 0.10
        ElseIf $COA_num >= 6.00 And $COA_num < 10 Then
            $COA_num += 0.20
        ElseIf $COA_num >= 10.00 And $COA_num < 20 Then
            $COA_num += 0.50
        ElseIf $COA_num >= 20.00 And $COA_num < 30 Then
            $COA_num += 1.00
        ElseIf $COA_num >= 30.00 And $COA_num < 50 Then
            $COA_num += 2.00
        ElseIf $COA_num >= 50.00 And $COA_num < 100 Then
            $COA_num += 5.00
        ElseIf $COA_num >= 100.00 And $COA_num < 1000 Then
            $COA_num += 10.00
        EndIf
        $odds_arr[$COA_int] = $COA_num
        If $COA_num >= 1000 Then
            ExitLoop
        EndIf
        ToolTip($COA_num, 0, 0)
    WEnd
    $odds_arr[$COA_int+1] = 0
    _ArrayDisplay($odds_arr, "")oÝ÷ Û
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If you mean that the numbers are out by some very small amaount then that is because of the limitations of computers. The values like 1.45 are converted to a binary value when they are saved and then back when they have to be displayed as decimal. If you want to get results to an accuracy of 0.01 then you will need to add some code to display it the way you want.

[laffo16]

ive never heard of this sort of limition with numbers before.

While 1
    If $num <= 1.99 Then
        $num = Round($num + 0.01, 2)
    EndIf
    ToolTip($num, 0, 0)
    If $num >= 2 Then
        MsgBox(0, "", "yeh")
    EndIf
    Sleep(10)
WEnd

seems to do the trick, thanks for your help martin. i thought my autoit installation was corrupt up somethin lol

Edited April 10, 2009 by laffo16

[picaxe]

ve never heard of this sort of limition with numbers before.

FYI this thread is one of a few on the accuracy of floating point numbers.