// ConsoleApplication1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <math.h>
#include <cstdlib>
#include <iostream>
#include <thread>

void Task(double &partial, int terms)
{
	int terms_t = terms + 250000;
	 for (int i = terms; i < terms_t; i++)
	 {
         partial += pow(-1.0,i)/(2.0 * i + 1);
	 }
}
void lebizn(int terms)
{
	double partial = 0;
	for (int i = 0; i < terms; i++)
	 {
         partial += pow(-1.0,i)/(2.0 * i + 1);
	 }
	printf("%1.10lf \n", 4*partial);
}

void withTimer(int terms)
{
	auto start = std::chrono::high_resolution_clock::now();
	lebizn(terms);
	auto end = std::chrono::high_resolution_clock::now();
	std::chrono::duration<double, std::milli> elapsed = end-start;
	std::cout << "Waited Synch " << elapsed.count() << " ms\n";
}

int _tmain(int argc, _TCHAR* argv[])
{
	double partial;
	double partial1 = 0;
	double partial2 = 0;
	double partial3 = 0;
	double partial4 = 0;
	std::thread t1(Task,std::ref(partial1), 0);
	std::thread t2(Task,std::ref(partial2), 2500000);
	std::thread t3(Task,std::ref(partial3), 5000000);
	std::thread t4(Task,std::ref(partial4), 7500000);
	auto start = std::chrono::high_resolution_clock::now();
	t1.join();
	t2.join();
	t3.join();
	t4.join();
	partial = partial1 + partial2 + partial3 + partial4;
	double newPi = 4 * partial;
	printf("%1.10lf \n", newPi);
	auto end = std::chrono::high_resolution_clock::now();
	std::chrono::duration<double, std::milli> elapsed = end-start;
	std::cout << "Waited Async " << elapsed.count() << " ms\n";


	std::cout << "Sync " <<std::endl;
	withTimer(10000000);
	system("Pause");
	return 0;
}