diff options
author | Justin Bedo <cu@cua0.org> | 2013-08-10 08:36:48 +1000 |
---|---|---|
committer | Justin Bedo <cu@cua0.org> | 2013-08-10 08:36:48 +1000 |
commit | f85676749888e99fec419236d4823fe6250eddd1 (patch) | |
tree | 3bae597f74c8fb73860dc6448429cbaf719fbbb1 /frand.c |
Diffstat (limited to 'frand.c')
-rw-r--r-- | frand.c | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -0,0 +1,17 @@ +#include <u.h> +#include <libc.h> + +#define MASK 0x7fffffffL +#define NORM (1.0/(1.0+MASK)) + +double +frand(void) +{ + double x; + + do { + x = lrand() * NORM; + x = (x + lrand()) * NORM; + } while(x >= 1); + return x; +} |