[PRIR] Liczba pierwsza watki

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

using namespace std;

struct Date {
	int min, max;
	char filename[10];
};

DWORD WINAPI Function(LPVOID lpParam) {
	bool p;
	Date  *data = (Date*)lpParam;
	int i = data->min;
	int n = data->max;
	char* plik = data->filename;
	strcat(plik, ".txt");
	FILE * file = fopen(plik, "a");
	for (i ; i < n; i++)
	{
		p = true;

		for (int j = 2; j < i; j++)
			if (i % j == 0)
				p = false;

		if (p == true)
			fprintf(file,"%d\n", i);
	}
	fclose(file);
	return 0;

}

int main()
{
	int iww = 0, od = 0, pdo = 0, r = 0, tmp = 0, tod = 0, tpdo = 0;
	std::cin >> iww;
	std::cin >> od;
	std::cin >> pdo;

	HANDLE *h = new HANDLE[iww];
	DWORD *TID = new DWORD[iww];
	Date *dd = new Date[iww];

	tmp = (pdo - od) / iww;
	r = tmp;
	tod = od;
	for (int i = 0; i < iww; i++)
	{
		if (tmp >= pdo) tmp = pdo;
		char c = i + '0';
		dd[i] = {tod,r,c };
		h[i] = CreateThread(NULL, 0, Function, &dd[i], 0, &TID[i]);
		tod = r + 1;
		r = r + tmp;
	}


	WaitForMultipleObjects(iww, h, TRUE, INFINITE);

	for (int i = 0; i < iww; i++)
	{

		char filen[10];
		sprintf(filen, "%d.txt", i);
		FILE * file = fopen(filen,"r");

		while (!feof(file))
		{
			int s = 0;
			fscanf(file, "%d", &s);
			if(s != 0) cout << s << "\n";
		}
		fclose(file);
	}

	delete[] h;
	delete[] TID;
	delete[] dd;

	return 0;
}