[comp.lang.c] Random number generator functions? Help?!

jep@fantasci.UUCP (Joseph E Poplawski) (11/21/89)

I am trying to get two random number routines to work, one I have named 'rnd1'
and the second 'rnd2'.  What I would like is to have rnd1 return an integer
that ranges from 1 to the value of lim (which is passed as an argument) and
rnd2 to return an integer that ranges from lower to upper (which are also
passed as arguments).  It seemed to compile okay, but upon execution they
constantly return the same numbers even though I reseeded the random function
at each call.

Any ideas?  I have included the code following my signature.

By the way, this program is being written on an 80386 running ISC UNIX V.3.

-Jo
--
Joseph E Poplawski (Jo)
Home:  5 Sussex Drive, Willingboro, NJ  08046-1407    Phone:  +1 609 835-2846
UUCP:  ...{rutgers!rochester!moscom,princeton,pyrnj}!telesci!fantasci!jep

-----------------------------------------------------------------------------
main()
{
	long int	lr, rr;
	int		i;

	printf ("rnd2 returns:\n");
	for (i=0; i<15; ++i)
		printf ("%ld, ", rnd2(1,20));
	printf ("\n");
	for (i=0; i<15; ++i)
		printf ("%ld, ", rnd2(1,20));
	printf ("\n");
}

rnd1(lim)
int	lim;
{
	long int	lrand48(), time();

	srand(rand());
	srand48( (int) time ((long int *) 0));

	return((lrand48() % lim) + 1);
}

rnd2(lower, upper)
int	lower, upper;
{
	int		top = (upper - lower);
	long int	lrand48(), time();

	srand(rand());
	srand48( (int) time ((long int *) 0));

	return((lrand48() % (top + 1)) + lower);
}