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Strange behavior using ternary operator


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Can someone shed light on the following problem:

For $ix = 0 To 3
    $i = $ix
    $i1 = ($i = 1 Or $i = 2 ? $i : 0) ; This shows TRUE if $i = 1     WHY ?
    $i = $ix
    $i2 = ($i = 2 Or $i = 1 ? $i : 0) ; This shows TRUE if $i = 2     WHY ?
    $i = $ix
    $i3 = (($i = 1 Or $i = 2) ? $i : 0) ; This is OK. It shows always the digits 0, 1 or 2
    $i = $ix
    $i4 = (($i = 2 Or $i = 1) ? $i : 0) ; This is OK. It shows always the digits 0, 1 or 2

    MsgBox(Default, $ix, "$i1: " & $i1 & @LF & "$i2: " & $i2 & @LF & "$i3: " & $i3 & @LF & "$i4: " & $i4 & @LF, 0)
Next

App: Au3toCmd              UDF: _SingleScript()                             

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It's because you're not encasing the expression in () e.g. (($i = 1 Or $i = 2) ? $i : 0)

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Updated: 22/04/2018

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  • Solution

Exit,

It looks like an "operator priority" problem to me. The first 2 are actually Oring $ix = 1/2 and the result of the ternary - which is why you get a Boolean return. Once you add a few more parentheses to determine the evaluation order you get the expected results. :)

I always use external and internal parentheses when using ternary operations to avoid such problems:

( ( Expression ) ? ( True result ) : ( False result) )
Now there is no doubt how AutoIt should parse the content. ;)

M23

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