srand man page on SunOS

srand man page on SunOS

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rand(3UCB)	   SunOS/BSD Compatibility Library Functions	    rand(3UCB)

NAME
       rand, srand - simple random number generator

SYNOPSIS
       /usr/ucb/cc [ flag ... ] file ...

       int rand();

       int srand(seed)
       unsigned seed;

DESCRIPTION
       rand()  uses a multiplicative congruential random number generator with
       period 2^32 to return successive pseudo-random  numbers	in  the	 range
       from 0 to 2^31 −1.

       srand()	can be called at any time to reset the random-number generator
       to a random starting point. The generator is initially  seeded  with  a
       value of 1.

SEE ALSO
       cc(1B), drand48(3C), rand(3C), random(3C)

NOTES
       Use of these interfaces should be restricted to only applications writ‐
       ten on BSD platforms.  Use of these interfaces with any of  the	system
       libraries or in multi-thread applications is unsupported.

       The  spectral  properties  of  rand() leave a great deal to be desired.
       drand48(3C) and random(3C) provide much better, though more  elaborate,
       random-number generators.

       The low bits of the numbers generated are not very random; use the mid‐
       dle bits. In particular the lowest bit alternates between 0 and 1.

SunOS 5.10			  30 Oct 2007			    rand(3UCB)

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