随机数生成器

 

int _tmain(int /*argc*/, _TCHAR* /*argv[]*/)
{
	struct __timeb64 ftime_timeb;
	_ftime64_s(&(ftime_timeb));
	//time_t time_tmp = ftime_timeb.time;
	int i_tmp = ftime_timeb.time % 0x7FFFFFFF;
	srand(i_tmp);
	map<int, int> temp;
	for (int i = 0; i < 3000; i++)
	{
		int k = rand() % 29;
		temp[k]++;
	}

	for (auto& i : temp)
	{
		printf("%d\t%d\n", i.first, i.second);
	}
	// 主线程挂起
	for (;;)
	{
		getchar();

	}
}

　　

生成数据分析: 因为是3000次，0-29数据出现的次数均分在 100左右，均分。