rand和srand

#include "stdafx.h"

#include <stdlib.h>

#include <time.h>

int main(int argc, char* argv[])

{

 printf("Hello World!\n");

 srand(time(0));

 for (int i=0;i<10;i++)

 {

  printf("%x ",(int)rand()%1000);

 }

 printf("\n");

 for (int j=0;j<10;j++)

 {

  printf("%x ",(int)rand()%1000);

 }

 return 0;

}