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Sum return values of a function inside a loop

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Hello AutoIT community, 

Without getting into too much details about the script. I have general question - what is the best way to sum return values of function inside a loop? I have limited programming skills and I don't seem to get it working.

An example of what the script should do: Script opens excel files from a selected folder and cleans the each file. CleanExcelFiles function returns integer $iCount which counts the amount of rows deleted in an excel file. 


Func Example()

Local $sFileSelectFolder = FileSelectFolder("", "")

$aFileList = _FileListToArray($sFileSelectFolder, "*.xls")

Local $iResult = 0
For $i = 1 To $aFileList[0]
    $sFile = $sFileSelectFolder & "\" & $aFileList[$i]

    $iResult = CleanExcelFiles()

MsgBox("", "", "Total of "& $iResult& "actions were performed in all excels.")

Please advise a solution to sum all $iResults and return this total value after the script has finished cleaning all the excels.


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