Date: Sun, 02 Feb 2003 16:37:07 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: Bakul Shah <bakul@bitblocks.com>, Mark Murray <mark@grondar.org>, current@FreeBSD.ORG Subject: Re: rand() is broken Message-ID: <3E3DB9B3.A233B848@mindspring.com> References: <200302022106.h12L6naX051530@grimreaper.grondar.org> <200302022159.QAA13933@wellington.cnchost.com> <20030202223725.GA72744@troutmask.apl.washington.edu>
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Steve Kargl wrote:
> I was going to stay out of this, but
>
> #include <stdio.h>
> #include <stdlib.h>
> int main(void) {
> int i;
> long x;
> x = 100L;
> srandom(x);
> for (i = 0; i < 1010; i++) {
> x = random();
> printf("%ld\n", x);
> }
> return 0;
> }
>
> Last 10 digits.
>
> FreeBSD Redhat SunOS
> 660787754 660787754 645318364
> 327548691 327548691 1583150371
> 2009993994 2009993994 715222008
> 1653966416 1653966416 1349166998
> 1074113008 1074113008 566227131
> 2142626740 2142626740 1382825076
> 1517775852 1517775852 583981903
> 1453318125 1453318125 1453942393
> 619607807 619607807 1952958724
> 199986393 199986393 1599163286
386BSD 0.1+
patchkit TRU64
660787754 660787754
327548691 327548691
2009993994 2009993994
1653966416 1653966416
1074113008 1074113008
2142626740 2142626740
1517775852 1517775852
1453318125 1453318125
619607807 619607807
199986393 199986393
I can fire up my HP/UX and SunOS 4.1.3-U1 boxes too, if you need
those, but I'm pretty sure the reason you got a different answer
for newer Solaris was because it uses the SVR4 code, instead.
The *48() functions are also identical (linear congruential); I
used to use them for physics simulations. The f2c compiler did
not have the functions until I personally added them to the
library.
-- Terry
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