Reply to thread

Message: [QUOTE="Udyant Wig, post: 5155142"] The output using the rand() from FreeBSD libc: /* freebsd-rand.c begins */ /*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <stdio.h> #include <stdlib.h> static int do_rand(unsigned long *ctx) { #ifdef USE_WEAK_SEEDING /* * Historic implementation compatibility. * The random sequences do not vary much with the seed, * even with overflowing. */ return ((*ctx = *ctx * 1103515245 + 12345) % ((u_long)RAND_MAX + 1)); #else /* !USE_WEAK_SEEDING */ /* * Compute x = (7^5 * x) mod (2^31 - 1) * without overflowing 31 bits: * (2^31 - 1) = 127773 * (7^5) + 2836 * From "Random number generators: good ones are hard to find", * Park and Miller, Communications of the ACM, vol. 31, no. 10, * October 1988, p. 1195. */ long hi, lo, x; /* Must be in [1, 0x7ffffffe] range at this point. */ hi = *ctx / 127773; lo = *ctx % 127773; x = 16807 * lo - 2836 * hi; if (x < 0) x += 0x7fffffff; *ctx = x; /* Transform to [0, 0x7ffffffd] range. */ return (x - 1); #endif /* !USE_WEAK_SEEDING */ } static u_long next = #ifdef USE_WEAK_SEEDING 1; #else 2; #endif int rand() { return (do_rand(&next)); } int main(void) { int i; for (i = 0; i < 64; i ++) { printf("%d", rand() % 2); } putchar('\n'); return 0; } /* freebsd-rand.c ends */ $ ./freebsd-rand 1101011000100110011110000010100011010001100001001101111110010001 [/QUOTE]

Verification