#include <iostream>
	#include <atomic>
	#include <thread>

	std::atomic<int>    last=2;
	std::atomic<int>    last_Value = 0;
	std::atomic<bool>   running = true;

	void function_Thread_1()
	{
		  while(running)
		  {
			  if(last == 2)
			  {
				  last_Value = last_Value + 1;
				  std::cout << last_Value << std::endl;
				  last = 1;
			  }
		  }
	}

	void function_Thread_2()
	{
		  while(running)
		  {
			  if(last == 1)
			  {
				  last_Value = last_Value + 1;
				  std::cout << last_Value << std::endl;
				  last = 2;
			  }
		  }
	}

	int main() 
	{
		std::thread a(function_Thread_1);
		std::thread b(function_Thread_2);

		while(last_Value != 6){}//we want to print 1 to 6

		running = false;//inform threads we are about to stop

		a.join();
		b.join();//join
		return 0;
	}