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 library is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU Library General Public
9 // License as published by the Free Software Foundation; either
10 // version 2 of the License, or (at your option) any later version.
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // Library General Public License for more details.
17 // You should have received a copy of the GNU Library General Public
18 // License along with this library; if not, write to the
19 // Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 // Boston, MA 02111-1307, USA.
30 #include <stdlib.h> // for random(), srandom()
31 #include <time.h> // for time() to seed srandom()
33 #include "fg_random.h"
38 # define RAND_MAX 2147483647
44 long int random(void);
45 void srandom(unsigned int seed);
50 // Seed the random number generater with time() so we don't see the
51 // same sequence every time
52 void fg_srandom(void) {
53 // fgPrintf( FG_MATH, FG_INFO, "Seeding random number generater\n");
63 // return a random number between [0.0, 1.0)
64 double fg_random(void) {
66 return(rand() / (double)RAND_MAX);
68 return(random() / (double)RAND_MAX);