srand((unsigned)time(NULL))

参考链接：https://blog.csdn.net/jx232515/article/details/51510336

#include 

void test_rand(void);

int main() {
     
    std::cout << "Hello, World!" << std::endl;
    test_rand();
    return 0;
}

void test_rand(void)
{
     
    unsigned long n;
    srand((unsigned)time(NULL));
    for(int i=0;i<10;i++)
    {
     
        n=rand();
        printf("%d\n",n);
    }
}

Hello, World!
17789874
1069985847
1763478094
1985872515
1074450203
743569104
532627135
1371125949
448608617
1938291674