Math::RNG::Microsoft - a pseudo-random number generator compatible with Visual C.


version 0.2.0


    use Math::RNG::Microsoft;

    my $randomizer = Math::RNG::Microsoft->new(seed => 24);

    my $random_digit = $randomizer->rand_max(10);


This is a random number generator used by Games::ABC_Path::Generator, which emulates the one found in Microsoft's Visual C++. It was utilised here, out of familiarity and accessibility, because it is commonly used to generate Freecell layouts in the Freecell world (see ).

NOTE: This is not a cryptologically secure random number generator, nor is it a particularly good one, so its use is discouraged unless compatibility with the Windows C Run-time-library is needed.



The constructor. Accepts a numeric seed as an argument.

    my $randomizer = Math::RNG::Microsoft->new(seed => 1);


Returns a random integer from 0 up to 0x7fff - 1.

    my $n = $randomizer->rand()


Returns a random integer in the range 0 to ($max-1).

    my $n = $randomizer->max_rand($max);
    # $n is now between 0 and $max - 1.


Can be used to re-assign the seed of the randomizer (though not recommended).

my $array_ref = $randomizer->shuffle(\@array)

Shuffles the array reference of the first argument, destroys it and returns it. This is using the fisher-yates shuffle.



The following websites have more information about this module, and may be of help to you. As always, in addition to those websites please use your favorite search engine to discover more resources.

Bugs / Feature Requests

Please report any bugs or feature requests by email to bug-math-rng-microsoft at, or through the web interface at You will be automatically notified of any progress on the request by the system.

Source Code

The code is open to the world, and available for you to hack on. Please feel free to browse it and play with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull from your repository :)

  git clone


Shlomi Fish <>


Please report any bugs or feature requests on the bugtracker website or by email to

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.


This software is Copyright (c) 2013 by Shlomi Fish.

This is free software, licensed under:

  The MIT (X11) License