using System;

using System.Numerics;

​

public class Program

{

    public static void Main()

    {

        BigInteger bi1 = 2147483647;

        Console.WriteLine("BigInteger: {0}", bi1);

        // BigInteger from double value

        BigInteger bi2 = new BigInteger(2147483647);

        Console.WriteLine("BigInteger from double value: {0}", bi2);

        // BigInteger from Int64 value

        BigInteger bi3 = new BigInteger(9223372036854775807);

        Console.WriteLine("BigInteger from Int64 value: {0}", bi3);

        BigInteger bi4 = new BigInteger(18446744073709551615);

        Console.WriteLine("BigInteger from UInt64 value: {0}", bi4);

    }

}