[REBOL] Antwort: Re: Antwort: Re: (No subject)Date: Wed, 22 Nov 2000 00:30:29 +1

From: sharriff::aina::med-iq::de at: 21-Nov-2000 15:56

Thanks Chris!

Sharriff Aina

                    Chris
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                    21.11.00 15:36
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[Sharriff--Aina--med-iq--de] wrote:
> ..err Brett,  it took me so long to decide whether to ask, since I
thought
> it would be too embarrasing. But alas! no matter how hard I squint at
this
> snippet, the less I understand. I tried it out in the console, it works,
> but the value that makes the "print" switch baffles me... either checks
to
> see if  "  row-colour "  is eqaul to  " 'blue
>  "  right? but row-clour has already been passed the reference to 'blue
so
> it should always be true?????!!

Go through it in the loop by hand:

start with row-colour: 'blue
print blue
row-colour equals 'blue so set row-colour to 'black
print black
row-colour is not equal to 'blue so set row-colour to 'blue
and so on...

Haven't seen one like that outside C or assembler though :) A lot of
people
prefer to do a modulo 2 on the loop counter and use a different colour
depending n whether the result is 0 or 1 (I failed a job test once
because
I used this sort of flip rather than a modulo, seems some people
consider
it a bit "dirty"..))

Chris
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Explorer2260 Designer and Coder
http://www.starforge.co.uk

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