1 // fg_random.c -- routines to handle random number generation
3 // Written by Curtis Olson, started July 1997.
5 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <stdlib.h> // for random(), srandom()
30 #include <time.h> // for time() to seed srandom()
32 #include "fg_random.h"
37 # define RAND_MAX 2147483647
43 long int random(void);
44 void srandom(unsigned int seed);
49 // Seed the random number generater with time() so we don't see the
50 // same sequence every time
51 void fg_srandom(void) {
52 // fgPrintf( FG_MATH, FG_INFO, "Seeding random number generater\n");
62 // return a random number between [0.0, 1.0)
63 double fg_random(void) {
65 return(rand() / (double)RAND_MAX);
67 return(random() / (double)RAND_MAX);