C++学习（七）：C++生成日期+流水号（201908070001、201908070002、201908070003）的uid

#include 
#include 

std::string haha ()
{
	char buffer[80];
	std::string s, num_tmp, date;
	s = "20190807";
	static std::string a = "";
	static int uid_number = 0;
	if (s == a)
	{
		uid_number += 1;
	}
	else
	{
		a = s;
		uid_number = 1;
	}
	//num_tmp = to_string(uid_number);
	
	sprintf(buffer, "%04d", uid_number);
	date = a + buffer;
	std::cout << buffer << std::endl;
	std::cout << a << std::endl;
	std::cout << date << std::endl;
	return(date);
}

int main()
{
	std::string a = haha();
	std::string b = haha();
	return 0;
}