ref: 65ef69a85d1c0f4694a361f5a0a99bdbb4f2cd95
dir: /sys/src/libc/port/frand.c/
#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; }