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From: mcc@tyrolia.cs.princeton.edu (Martin C. Carlisle)
Subject: Re: Random Number problems
Date: 1997/10/01
Message-ID: <60tsk9$5gg$1@cnn.Princeton.EDU>#1/1
X-Deja-AN: 278854695
References: <60q1hm$8oq$1@goanna.cs.rmit.edu.au> <3431B598.41C6@activist.com>
Organization: US Air Force Academy, Dept of Computer Science
Newsgroups: comp.lang.ada
Date: 1997-10-01T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <3431B598.41C6@activist.com>,
David Muhammad  <guru@activist.com> wrote:
>>I am trying to write a function that will
> use a Random Number Generator and then return a random value between
>1 and 52. I have written the Random  Number Generator function but how
>do I tell the compiler to select a number between 1 and  52.
>
>a) declare a subtype
>	subtype pseudorand is range 1..52
>b) Call my randomnumber from function Rand_Num 
>c) NOw somehow convert some "Number" to a range between 1 and 52.
>I am stuck ??

Most people would instead use the very nice built-in random number
generator.

E.g.  

package my_random is new Ada.Numerics.Discrete_Random(pseudorand);
g : my_random.generator;
x : pseudorand;

begin

my_random.reset(g);
x := my_random.random(g);

For more info, see LRM A.5.2, Barnes p. 54, Feldman pp 320-322,
Cohen p. 93

If you insist on using your own, you want to use mod.

--Martin

-- 
Martin C. Carlisle, Computer Science, US Air Force Academy
mcc@cs.usafa.af.mil, http://www.usafa.af.mil/dfcs/bios/carlisle.html
DISCLAIMER:  This content in no way reflects the opinions, standard or 
policy of the US Air Force Academy or the United States Government.