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.
)
and
srand(
)
functions
conform to
ANSI X3.159-1989 (``ANSI C89'') .
The
rand_r(
)
function conforms to
IEEE Std 1003.1c-1995 (``POSIX.1'') .