rand.c

来自「A order algoritm comparison by the C tim」· C语言 代码 · 共 31 行

#include "in.h"

void update_seed()
{
 seed=(double)(time (NULL));
}

double l_rand_alg()
{
int a=16807;
int m=2147483647;
int q=127773;
int r=2836;
double lo,hi,test;

hi=(int)(seed/q);
lo=seed-q*hi;
test=a*lo-r*hi;
if (test<0.0)seed=test+m;
else seed=test;
return seed/m;
}

int l_int_rand(int n )
{
 int s;
 s=(int)(l_rand_alg()*n);
 return s;
}