[Mono-devel-list] System.Random bug?

[Sebastien Pouliot]

Hello Bart,

> Console.WriteLine(R.Next(Int32.MinValue, Int32.MaxValue));

Good catch. In this case the random part "disappear" because we always add
Int32.MinValue (negative) - so the result can't be anything else than
Int32.MinValue.

return (int)(Sample () * (maxValue - minValue)) + minValue;

> However, R.Next() without parameters does provide random numbers, all
> positive. A bug?

Not in this case. The positive numbers are normal because a call to
	R.Next ();
is equivalent to
	R.Next (0, Int32.MaxValue);


Thanks for the report. I'll get a look into this.
If possible try to report bugs into bugzilla - just to be sure it doesn't
get lost in the mail during weekends ;-).

Sebastien Pouliot
http://pages.infinit.net/ctech/poupou.html


-----Original Message-----
From: mono-devel-list-admin at lists.ximian.com
[mailto:mono-devel-list-admin at lists.ximian.com]On Behalf Of Bart Van
Rompaey
Sent: 14 mars 2004 16:17
To: mono-devel-list at lists.ximian.com
Subject: [Mono-devel-list] System.Random bug?


I experienced strange behaviour from System.Random when executing the
following piece of code (mono 0.30):

using System;

public class randomtest {
	private const long RANDOM_SEED = 10101010;

	public static void Main(string[] args) {
		int i;

		Random R = new System.Random((System.Int32) RANDOM_SEED);
		Console.WriteLine(Int32.MinValue);
		Console.WriteLine(Int32.MaxValue);
		Console.WriteLine();
		for(i = 0; i < 10; i++) {
			Console.WriteLine(R.Next(Int32.MinValue, Int32.MaxValue));
		}
	}
}

The output is as follows:
-2147483648
2147483647

-2147483648
-2147483648
-2147483648
-2147483648
-2147483648
-2147483648
-2147483648
-2147483648
-2147483648
-2147483648

However, R.Next() without parameters does provide random numbers, all
positive. A bug?

Bart.


--
Bart Van Rompaey <bart at perfectpc.be>

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