using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Numerics;
using System.Collections;

namespace ConsoleApplication666
{
    class Program
    {
        [DllImport("kernel32.dll")]
        private static extern void GetSystemTimePreciseAsFileTime(out long fileTime);

        // 将 FILETIME (long) 转换为 DateTime
        public static DateTime GetNowPrecise()
        {
            long fileTime;
            GetSystemTimePreciseAsFileTime(out fileTime);
            DateTime localTime = DateTime.FromFileTimeUtc(fileTime).ToLocalTime();
            return localTime;

        }
        static void Main(string[] args)
        {


            BigInteger hugeNumber = BigInteger.Parse("1234567890123456789012345678901234567890");
            var H= hugeNumber.ToByteArray();

            BitArray bi = new BitArray(H);


            // 从字节数组创建
            byte[] bytes = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
            BigInteger fromBytes = new BigInteger(bytes);

            // 基本运算
            BigInteger sum = hugeNumber + 1;
            BigInteger product = hugeNumber * 2;

            Console.WriteLine("大数字: {0}", hugeNumber);
            Console.WriteLine("加1: {0}", sum);
            Console.WriteLine("乘2: {0}", product);

            // 比较操作
            if (hugeNumber > BigInteger.Parse("100000000000000000000"))
            {
                Console.WriteLine("这是一个非常大的数字");
            }

            DateTime ddd = GetNowPrecise();
            string tii = ddd.ToString("yyyy-MM-dd HH:mm:ss.ffffff");
            Console.WriteLine(tii);
            Console.ReadLine();
        }
    }
}