cprime

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <fstream>
#include <ctime>
#include <Windows.h>    //Sleep

using namespace std;

/*
    (Number Limits)

    int : 2147483647
    uint    : 4294967295
*/

#define MAX_NUM 10000000    // 2.1kkk for int, 4.2kkk for uint

// Our file where we will store prime numbers
ofstream myFile;

// Function Declaration
bool isPrime(unsigned int N);   // Return if a number is Prime number
bool OpenFile();        // Opens the file where we will store prime numbers
bool CloseFile();       // Close the file
void Write(unsigned int n); // Write to file

int main()
{
    clock_t startTime = clock();
    printf("This process will take a lot of time\n\n");

    // Small delay before start
    while((clock() - startTime) < 2000)
    { }
    system("cls");

    // Prepeare file for write
    if (!OpenFile())
        printf("File failed to (open)!");

    clock_t temp = startTime;
    int tempDelay = 1000;   //1 sec

    #pragma omp parallel num_threads(2)
    {
        #pragma omp for
        for(unsigned int i=0; i < MAX_NUM; i++)
        {
            if (isPrime(i))
            {
                Write(i);

                if ((clock() - temp) >= tempDelay)
                {
                    system("cls");
                    printf("[%d%%] %d / %d till now has elapsed (%d) seconds\n", i*100 / MAX_NUM, i, MAX_NUM, abs(clock()/1000));
                    temp += tempDelay;
                }
            }
        }
    }

    clock_t endTime = clock();
    clock_t duration = ( clock() - startTime ) / (double) CLOCKS_PER_SEC;
    printf("\nStart Time:\t%d milliseconds\n", startTime);
    printf("End Time  :\t%d milliseconds\n", endTime);
    printf("Duration  :\t%d minutes\n", duration/60);
    printf("Duration  :\t%d seconds\n", duration);

    // Write time info to file
    Write(startTime);
    Write(endTime);
    Write(duration);

    // Close file, our work is finished
    if (!CloseFile())
        printf("File failed to (close)!");


    return 0;
}

// Return if a number is Prime number
bool isPrime(unsigned N)
{
    // 2 is prime number
    if (N == 2)
        return true;

    // If rest of an division is 0, then is not prime number
    if (N % 2 == 0)
        return false;

    if (N >= 2)
    {
        #pragma omp parallel num_threads(2)
        {
            #pragma omp for
            for(unsigned int i=3; i <= sqrt((float)N); i+=2)
            {
                if ((N % i) == 0)
                    return false;
            }
        }
    }
    else
        return false;

    return true;
}

// Opens the file where we will store prime numbers
bool OpenFile()
{
    try {
        myFile.open("prime2.txt");
    }
    catch(...){
        return false;
    }

    return true;

}

// Close the file
bool CloseFile()
{
    try  {
        myFile.flush();
        myFile.close();
    }
    catch(...){
        return false;
    }

    return true;

}

// Write to file
void Write(unsigned int n)
{
    myFile << n << endl;
}