RAND(3) | Library Functions Manual | RAND(3) |
rand
, srand
,
rand_r
—
#include <stdlib.h>
void
srand
(unsigned
int seed);
int
rand
(void);
int
rand_r
(unsigned
int *seed);
The rand
() function computes a sequence of
pseudo-random integers in the range of 0 to RAND_MAX
(as defined by the header file
<stdlib.h>
).
The srand
() function sets its argument as
the seed for a new sequence of pseudo-random numbers to be returned by
rand
(). These sequences are repeatable by calling
srand
() with the same seed value.
If no seed value is provided, the rand
()
function is automatically seeded with a value of 1.
The rand_r
() function is a reentrant
interface to rand
(); the seed has to be supplied and
is maintained by the caller.
rand
() and srand
() functions
conform to ANSI X3.159-1989
(“ANSI C89”). The rand_r
()
function conforms to IEEE Std 1003.1c-1995
(“POSIX.1c”).
June 4, 1993 | NetBSD 9.2 |