Stack variable usage?

[youtuber]

How should the stack variable $StackVariable1 and $StackVariable2 be positioned in the loop?

Which is correct to add stack variables inside or outside the loop?

#include <WinAPI.au3>
Local $Array[5] = [1, 2, 3, 4, 5]

While 1
    Local $StackVariable1 = ""
    Sleep(100)
    For $i = 0 To UBound($Array) - 1
        $iRandom1 = Random(0, $Array[$i], 1)
        If StringInStr($iRandom1, "3") Then
            $StackVariable1 &= $iRandom1 & @CRLF
            ConsoleWrite("$StackVariable1 : " & $StackVariable1 & @CRLF)
        EndIf
    Next

    While 2
        Local $StackVariable2 = ""
        Sleep(200)
        For $i2 = 0 To UBound($Array) - 1
            $iRandom2 = Random(0, $Array[$i2], 1)
            If StringInStr($iRandom2, "4") Then
                $StackVariable2 &= $iRandom2 & @CRLF
                ConsoleWrite("$StackVariable2 : " & $StackVariable2 & @CRLF)
            EndIf
        Next

        If $StackVariable1 <> $StackVariable2 Then
            If Not $StackVariable2 = "" Then
                _WinAPI_MessageBeep(5)
                Sleep(2000)
                TrayTip("$StackVariable2", $StackVariable2, 30, 1)
                Sleep(2000)
                ExitLoop
            EndIf
        EndIf
    WEnd
WEnd

or

#include <WinAPI.au3>
Local $Array[5] = [1, 2, 3, 4, 5]
Local $StackVariable1 = ""
Local $StackVariable2 = ""

While 1
    Sleep(100)
    For $i = 0 To UBound($Array) - 1
        $iRandom1 = Random(0, $Array[$i], 1)
        If StringInStr($iRandom1, "3") Then
            $StackVariable1 &= $iRandom1 & @CRLF
            ConsoleWrite("$StackVariable1 : " & $StackVariable1 & @CRLF)
        EndIf
    Next

    While 2
        Sleep(200)
        For $i2 = 0 To UBound($Array) - 1
            $iRandom2 = Random(0, $Array[$i2], 1)
            If StringInStr($iRandom2, "4") Then
                $StackVariable2 &= $iRandom2 & @CRLF
                ConsoleWrite("$StackVariable2 : " & $StackVariable2 & @CRLF)
            EndIf
        Next

        If $StackVariable1 <> $StackVariable2 Then
            If Not $StackVariable2 = "" Then
                _WinAPI_MessageBeep(5)
                Sleep(2000)
                TrayTip("$StackVariable2", $StackVariable2, 30, 1)
                Sleep(2000)
                ExitLoop
            EndIf
        EndIf
    WEnd
WEnd

 

[JockoDundee]

I’ll usually let the interpreter handle the stack variables at runtime.

But it’s rare to see a program which requires the use of Random, aside from testing or gaming.

What is it doing in this case?

Btw, take a look at SRandom() in case your results are repeating.

 

[pseakins]

I am not sure what you are trying to achieve with your "StackVariable"s  as this is purely a programmatic concept. You can do it any way you want.

However, there is no exit from either of your examples as "While 1" forms an endless loop. For a permanent loop the value following "While" can be anything at all, so long as it is not 0 or null. So, While "fred" would work equally well.

Edit: In your second example  the variables are being concatenated within an endless loop so eventually the code will reach the memory limit and crash.

Edited April 20, 2021 by pseakins

[JockoDundee]

7 minutes ago, pseakins said:

However, there is no exit from either of your examples as "While 1" forms an endless loop.

In the case of example 2, it should exit, albeit ungracefully, after much sleeping and beeping, due to the unconstrained variable concatenation.  Could take a while, though.

It will, most ironically, crash it’s own stack variables into the real stack