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VitAl2013

problem of accuracy

3 posts in this topic

#include <GUIConstants.au3>

#Region ### START Koda GUI section ### Form=

$Form2 = GUICreate("primer", 149, 132, 303, 219)

$Button1 = GUICtrlCreateButton("Calc", 24, 24, 97, 57, 0)

$input = GUICtrlCreateInput("2.082", 24, 96, 97, 21)

GUISetState(@SW_SHOW)

#EndRegion ### END Koda GUI section ###

While 1

$nMsg = GUIGetMsg()

Switch $nMsg

Case $Button1

$target = GUICtrlRead ($input)

lenght_analiz ($target)

Case $GUI_EVENT_CLOSE

Exit

EndSwitch

WEnd

Func lenght_analiz ($len_a)

$ostatok_1 = Round ($len_a)

MsgBox(4096, "step 2", $ostatok_1)

$ostatok_2 = $len_a - $ostatok_1

MsgBox(4096, "step 3", "Strange here: " & $ostatok_2)

$ostatok_3 = StringTrimLeft ($ostatok_2, 2)

MsgBox(4096, "step 4", $ostatok_3)

$result = StringLen($ostatok_3)

MsgBox(4096, "Test", "Answer: " & $result)

Exit

EndFunc

After minus operation I have 0.081999999999 and not 0.082. Why and what to do?

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#2 ·  Posted (edited)

VitAl2013,

It is a floating point arithmetic problem. Look at this thread.

M23

Edit: Welcome to the AutoIt forums, by the way!

Edited by Melba23

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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After minus operation I have 0.081999999999 and not 0.082. Why and what to do?

It's been discussed many times, but computers store numbers in a way that means that exact representation is not always possible or not achieved and results will be to the accuracy of the number of bits used for the calculation. If you want to show the result to the nearest 0.0001 then you can do this

MsgBox(4096, "step 3", "Strange here: " & stringformat("%.4f",$ostatok_2))

or you could have done this at an earlier stage

$ostatok_2 = Round($len_a - $ostatok_1,4)

Serial port communications UDF Includes functions for binary transmission and reception.printing UDF Useful for graphs, forms, labels, reports etc.Add User Call Tips to SciTE for functions in UDFs not included with AutoIt and for your own scripts.Functions with parameters in OnEvent mode and for Hot Keys One function replaces GuiSetOnEvent, GuiCtrlSetOnEvent and HotKeySet.UDF IsConnected2 for notification of status of connected state of many urls or IPs, without slowing the script.

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