[PRIR] PI Watki

#include "pch.h"
#include <iostream>
#include <conio.h>
#include <stdio.h>
#include <ctime>
#include <Windows.h>

using namespace std;

double *d;

struct lpi {

    unsigned int piod, pido;
        double val;
};


DWORD WINAPI PiFunction(LPVOID lpParam) {

    lpi *pidata = (lpi*)lpParam;
    unsigned int i = pidata->piod;
    unsigned int z = pidata->pido;

    double pi = 0;
    for (i;i<z;i++) {

        int c = 0;
        if (i % 2 == 0) c = 1;
        else c = -1;

        pi += double(c) / (2 * i + 1);

    }
    pidata->val = pi;
    return 0;
}

int main()
{

    double pii = 0;
    int threadnumber = 5;
    unsigned int thtemp, thtemp2, tmp = 0;
    unsigned int precision = 10000000;
    double duration;
    d = new double[threadnumber];
    clock_t start;
    start = std::clock();



        for (int i = 0; i < precision; i++) {
            int c = 0;
            if (i % 2 == 0) c = 1;
            else c = -1;
            pii += double(c) / (2 * i + 1);

        }

    duration = (clock() - start) / (double)CLOCKS_PER_SEC;

    cout.precision(10);
    cout << pii * 4 << " W czasie:" << duration << endl;

    HANDLE *h = new HANDLE[threadnumber];
    DWORD *TID = new DWORD[threadnumber];
    lpi *PiData = new lpi[threadnumber];

    thtemp = precision / threadnumber;
    thtemp2 = thtemp;
    start = std::clock();
        for (int i = 0; i < threadnumber; i++) {
            if (thtemp2 > precision) thtemp2 = precision;
            PiData[i].piod = tmp;
            PiData[i].pido = thtemp2;
            h[i] = CreateThread(NULL, 0, PiFunction, &PiData[i], 0, &TID[i]);
            tmp = thtemp2;
            thtemp2 = thtemp2 + thtemp;
        }

    WaitForMultipleObjects(5, h, TRUE, INFINITE);
    duration = (clock() - start) / (double)CLOCKS_PER_SEC;
    double result = 0;
    for (int i = 0; i < threadnumber; i++) {

        result += PiData[i].val;
    }

    cout << (result)*4.0 << " W czasie:" << duration;
}