Thanks, Mike.

What I realised in the mean-time ..

php has precedence of ! (NOT) above all those on your list except ()
So
     IF NOT Retval = "Esc" ; which works fine
does not become
     if( ! $Retval == 'Esc') // valid php but wrong result!
it should be
     if( ! ($Retval == 'Esc'))

I used the above pal construct only twice in 30k lines of pal, more 
commonly using
     IF Retval <> "Esc"
which converts nicely to
     if($Retval <> 'Esc')
so I didn't spot it in earlier run-time testing.


-B

On 7/9/17 2:10 am, Michael Kennedy wrote:
> The manuals say:
>   () - Inner pairs first
>   (All the following are Left-to-Right]...
>   * /
>   + -
>   = <> < <= > >=
>   NOT
>   AND
>   OR
> 
> ...all as expected...
> 
> There's no mention of that darn "unary minus", nor of different contexts 
> of "NOT", etc...
> 
> I assume that PDoxDOS represents (1=2), [False], internally as 0, but I 
> don't recall how it represents (1=1) [True, = NOT False]. I  think most 
> systems use "-1", but some systems use just "1", and maybe some use "any 
> non-zero value"?.....
> 
>    - Mike
> 
> 
> On 04/09/2017 18:40, Bernie van't Hof wrote:
>> Anyone have handy a operator precedence list for PDOX DOS?
>>
>> Having an issue with 'NOT' and darned if I can see why.
>>
>> Thanks,
>> B