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From: starritt@rlmsystems.com.au (Andy Starritt)
Newsgroups: comp.lang.ada
Subject: Re: Pseudo Random coding problem
Date: 7 Jan 2003 20:08:18 -0800
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brianc@billybob.demon.co.uk (Brian A Crawford) wrote in message news:<3e1b633f.3280604@news.demon.co.uk>...

> I am trying to start a small programming project that will output
> pseudo-random numbers.
> The program looks at the numbers produced and if that number equals a
> predetermined value (20 in the case in the test program below) the
> program will then catch this fact and perform a number of loops and
> counts etc.
> 
> However I've fallen at the first hurdle.  I've heavily borrowed code
> from Ada95 by Feldman/Koffman (thankyou!) and find that the program
> sometimes sees the value 20 and on other occasions doesn't.
> It's very tempermental. 

Because your program loops only 15 times, and the random number
range is 1 to 50, I would expect 20 to turn up (on average) approx 
30% of the time.  It is supposed to be random after all ;-)


> The code is below.  Ive definitely missed something.    
> ________________________________________________
> 
> WITH Ada.Text_IO;
>    WITH Ada.Integer_Text_IO;
>    WITH Ada.Float_Text_IO;
>    WITH Ada.Numerics.Discrete_Random;
>            
>    procedure Random_Numbers is
>            
>       SUBTYPE RandomRange IS positive RANGE 1..50;
>            
>       PACKAGE Random_50 IS NEW Ada.Numerics.Discrete_Random
>          (Result_Subtype => RandomRange);
>               
>    
>       G: Random_50.Generator;   
>    
>    BEGIN -- Random_Numbers
>    
>       Random_50.Reset (Gen => G);  -- starts G from time of day clock
> 
>       for row in 1..15 loop
>       
>          Ada.Integer_Text_IO.Put
>                (Item => Random_50.Random(Gen => G), Width => 8);
>       
>          if  Random_50.Random(Gen => G) = 20 then
>             Ada.Text_io.put (Item => "Random Number is equal to
> Twenty");
> 
>             Ada.text_io.new_line;
>          end if;
>          Ada.text_io.new_line;
>       
>       end loop;
>    
>    END Random_Numbers;
> _______________________________________________________