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Elektra 0.11.0
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Defines for Rand. More...
#include <stdint.h>
Functions | |
void | elektraRand (int32_t *seed) |
Non cryptographic pseudo random number generator. More... | |
int32_t | elektraRandGetInitSeed (void) |
Random initial seed generator. More... | |
Defines for Rand.
void elektraRand | ( | int32_t * | seed | ) |
Non cryptographic pseudo random number generator.
By Ray Gardner www8.cs.umu.se/~isak/snippets/rg_rand.c
based on "Random Number Generators: Good Ones Are Hard to Find", S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), and "Two Fast Implementations of the 'Minimal Standard' Random Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), p. 87-88
linear congruential generator f(z) = 16807 z mod (2 ** 31 - 1)
uses L. Schrage's method to avoid overflow problems
Make sure the initial seed is: 0 < seed < ELEKTRARANDMAX
seed | a pointer to the seed |
int32_t elektraRandGetInitSeed | ( | void | ) |
Random initial seed generator.
Generates a random initial seed for the elektraRand (...)
function. Two invocations in the same second return the same random initial seed, due to the usage of time (0)
.
random | initial seed |