C语言编写的0~1的随机数的产生

# include <stdlib.h> # include <stdio.h> # include <time.h> double rnd() { double j; j=(double) rand() / (RAND_MAX); return j; } main() { time_t t; srand((unsigned) time(&t)); printf("r1=%f\n",rnd()); printf("r2=%f\n",rnd()); }