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$Revision: 23 $
This class implements a better random number generator than the C runtime
library. It is based on an algorithm provided by Guy Gascoigne - Piggford
) who got it from
a generator that originally appeared in "Toward a Universal
Random Number Generator" by George Marsaglia and Arif Zaman.
Florida State University Report: FSU-SCRI-87-50 (1987).
It was later modified by F. James and published in "A Review of
Pseudo-random Number Generators." Converted from FORTRAN to C by Phil
Linttell, James F. Hickling Management Consultants Ltd, Aug. 14, 1989. While
in FORTRAN, it was known as the RANMAR() generator. All I did was convert
it to a C++ class.
DWORD GetInteger( void )
Returns a 32-bit random integer.
double GetFloat( void )
Returns a random float between 0 and 1.
void InitializeSeed( void )
Initializes the seed value for the generator. To increase randomness,
it uses a combination of the number of milliseconds the NT machine has
been on and the number of free clusters on the current drive to seed
void SetSeed( DWORD new_seed )
Sets the seed to this value. You can use this if you don't like my
method of seeding.
These are what makes this class cool. You can use the class as a
void test_CRandomNumberGenerator( void )
WFCTRACEINIT( TEXT( "test_CRandomNumberGenerator()" ) );
int index = 0;
while( index < 20 )
_tprintf( TEXT( "DWORD random number is %lu\n" ), (DWORD) random_number );
_tprintf( TEXT( "double random number is %lf\n" ), (double) random_number );
uses the following API's:
Copyright, 2000, Samuel R. Blackburn
$Workfile: CRandomNumberGenerator.cpp $
$Modtime: 1/17/00 9:10a $