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Re: Checking array for double entries

To: REALbasic NUG <realbasic-nug@lists.realsoftware.com>
Subject: Re: Checking array for double entries
From: Tom Benson <tombenson@mac.com>
Date: Sun, 29 Jun 2008 09:14:10 +1000
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Put the values 1 to 70 into an array.

Scramble the array, then take the first 6 off the stack...

On 29/06/2008, at 5:22 AM, tobieichner77-rb@yahoo.de wrote:

Hello,

I wrote a small app that generates six random numbers out of a range from 1 to 70. The requirement is that no single number is used twice.

So far the only solution I came upon to prevent double entries is to compare all entries with each other. In the case of two equal entries, I simply re-create the random array again and do another check.

For example:

while x(1) = x(2) or x(1) = x(3) or x(1) = x(4) or x(1) = x(5) or x(1) = x(6) or x(2) = x(3) or x(2)= x(4) or x(2) = x(5) or x(2)= x(6) or x(3)= x(4) or x(3) = x(5) or x(3) = x(6) or x(4) = x(5) or x(4) = x(6) or x(5) = x(6)
   for y = 1 to 6 step 1
     x(y) = r.inrange(1,70)
   next
 wend

As you see, this leads to a long and ugly "or" chain, which will finally end into a total mess if there are, let's say, twenty numbers to compare with each other.

Can you give me a hint how I can manage this easier and more convenient ?

Bye,
Tobias.


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