random.c File Reference

A portable random number generator. More...

Go to the source code of this file.

Data Structures
struct	prandom_t
	A pseudo-random number generator. More...
Defines
#define	PRANDOM_SLOTS   16
#define	PRANDOM_MASK   0x3fc91ab4
#define	PRANDOM_A   16807
#define	PRANDOM_M   2147483647
#define	PRANDOM_Q   127773
#define	PRANDOM_R   2836
Functions
void	randstep (long *val)
	a primitive randomizing step, using a linear congruential generator.
void	srandom (unsigned _seed)
	Initialize pseudo-random number generator from seed.
long	random ()
	generate a random number
Variables
prandom_t	generator
	the generator used.

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Detailed Description

A portable random number generator.

Author:

Copyright (c) 2000 Markus L. Noga <markus@noga.de>

See Numerical Recipes in C 2nd Edition, p. 279-281 for inspiration.

Definition in file random.c.

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Define Documentation

#define PRANDOM_A   16807

Definition at line 19 of file random.c. Referenced by randstep().

#define PRANDOM_M   2147483647

Definition at line 20 of file random.c.

#define PRANDOM_MASK   0x3fc91ab4

Definition at line 17 of file random.c.

#define PRANDOM_Q   127773

Definition at line 21 of file random.c.

#define PRANDOM_R   2836

Definition at line 22 of file random.c. Referenced by randstep().

#define PRANDOM_SLOTS   16

Definition at line 16 of file random.c. Referenced by random(), and srandom().

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Function Documentation

long random (  void   )

generate a random number The random() function returns successive pseudo-random numbers Returns: a random number in the range from 0 to RAND_MAX Definition at line 77 of file random.c. References prandom_t::entry, generator, PRANDOM_SLOTS, randstep(), prandom_t::select, and prandom_t::state.

void randstep (  long *  val  )

a primitive randomizing step, using a linear congruential generator. Definition at line 49 of file random.c. References PRANDOM_A, and PRANDOM_R. Referenced by random(), and srandom().

void srandom (  unsigned  _seed  )

Initialize pseudo-random number generator from seed. Definition at line 58 of file random.c. References prandom_t::entry, generator, PRANDOM_SLOTS, randstep(), prandom_t::select, and prandom_t::state.

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Variable Documentation

prandom_t generator [static]

the generator used. Definition at line 39 of file random.c. Referenced by random(), and srandom().

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