程序代码：

#include <cstdio>
#include <cstdlib>
#include <conio.h>
#include "Prime.h"

void Pause(void);

const size_t NUMBER_PER_ROW = 10;

int main(void)
{
    OpenPrimeFile();

    unsigned int start = 1000000U;
    unsigned int end = 1002000U;
    size_t count = 0;
    for (unsigned int x = start; x <= end; ++x)
    {
        if (IsPrime(x))
        {
            printf_s("%6u", x);
            putchar((++count % NUMBER_PER_ROW == 0) ? '\n' : ' ');
        }
    }

    ClosePrimeFile();

    Pause();
    return EXIT_SUCCESS;
}

void Pause(void)
{
    printf_s("\nPress any key to continue...");
    _getch();
}

程序代码：

#pragma once

bool OpenPrimeFile(void);
void ClosePrimeFile(void);
bool IsPrime(unsigned int n);

程序代码：

#include <cstdio>
#include <cstdlib>
#include "Prime.h"

const char* File_Name = "Prime_Number.DAT";        // 素數表文件名
FILE* hPrime = NULL;                            // 素數表文件句柄

bool OpenPrimeFile(void)
{
    return (fopen_s(&hPrime, File_Name, "rb") == 0);
}

void ClosePrimeFile(void)
{
    if (hPrime)
    {
        fclose(hPrime);
    }
}

/*
功能: 判斷指定的整數是否素數
*/
bool IsPrime(unsigned int n)
{
    fseek(hPrime, n, SEEK_SET);
    return fgetc(hPrime) == 1;
}