Subj : Re: "On the Fly" Hex-numb conversion ... ???
To   : Klaus Meinhard
From : Jasen Betts
Date : Wed Mar 06 2002 10:55 pm

Hi Klaus.

04-Mar-02 08:40:00, Klaus Meinhard wrote to Steve


 KM> From: "Klaus Meinhard" <K_Meinhard@t-online.de>

 KM> Steve, Gerald,

 >> When you try to concatenate the values of two (or more) variables,
 KM> your
 >> schem would have
 KM> >
 >> %a%%b%%c%
 KM> >
 >> which is ambiguous - %% is also the representation of a literal %;
 >> the JP scheme
 KM> >
 >> %[a]%[b]%c
 KM> >
 >> is unambiguous.

 KM> Yes. On a purely theoretical basis: since 4DOS doesn't need the
 KM> second % char, it's occurrence gives rise to some interesting
 KM> parsing problems


 KM> Is %a%b equal to VarA and "b" or VarA and VarB? 4Dos has to check
 KM> the environment somehow, and that may need some (often negligible)
 KM> time

it depends - I ran into that pitfall with my chess batch.

where %a is a for loop variable it's VarA-VarB otherwise it's
VarA-LetterB.

 KM> In %a%%b% or %a%%b (which is valid too) Is what comes after VarA a
 KM> percent char( %%), or VarB? 4DOS has to decide, and may not do so
 KM> consistently across all versions or even across to 4NT etc

same problems with loop varables here.

 -=> Bye <=-

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 * Origin: "...all the modern inconveniences..."  -- Mark Twain (3:640/531.42)

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