Re: Lotto simulation

[Dirk Heinrichs <dirk.heinrichs@altum.de>]

montgrimpulo wrote:

> this is a placeholder of the task which I am trying to solve in Ada.
> As you may know in German Lotto there are 49 numbers 1..49
> from which you have to select 6 numbers to place a bet.
> 
> Second Round:
> Here does my problem start. Now I have a set of numbers where
> one number - which was randomly selected in the first round -
> is missing. How do I use the random function to select another
> random number out of the rest ?
> 
> Any ideas to answer that question ?

Let's look at how it works in reality: A random ball is selected out of a 
set of 49 balls, mixed randomly before the pick, resulting in a new set of 
48 balls, etc.

So you'd need to start with a sorted array of integers 1 to 49, mix it 
randomly and then pick a random index out of 1 to 49. The number at that 
index is then removed from the array.

You'd then create a new array of 48 integers filled with the numbers at 1 to 
picked-1 plus picked+1 to 49 of the former array, mix that array again and 
pick a random index out of 1 to 48. Again remove the number at that index.

Dito for round 3 to 6.

HTH...

	Dirk
-- 
Dirk Heinrichs <dirk.heinrichs@altum.de>
Tel: +49 (0)2471 209385 | Mobil: +49 (0)176 34473913
GPG Public Key CB614542 | Jabber: dirk.heinrichs@altum.de
Sichere Internetkommunikation: http://www.retroshare.org