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I am Jalpesh Vadgama a Microsoft MVP for Visual C# and BrainBench Certified ASP.NET Developer having more then 6 years of experience in .NET Technology.
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BigInteger in C# 4.0

Sep 14 2011 4:11AM by Jalpesh   

In C# 4.0 Microsoft has added so many features and I love all most all the features. In today’s post we are going to discuss BigInteger Class. During programming some complex systems often we need a very big numbers. For example if we use some of asymmetrical cryptographic feature which require to use large numbers or we can give simple example of factorial where we sometime reached to limit of data type provided by C# compiler. At that time this BigInteger data type can be very handy. You can store 232 to 264 number in this data type. So its very big and you can copy very very big number in that data type.

So let’s take a simple example to write a factorial program. BigInteger data type comes under System.Numerics namespace. So first we have to add reference to our program to System.Numerics assembly like following.

Big Integer In C# 4.0 - Add Reference to System. Numeric

Now we have added the reference to System.Numeric so we are ready for code. Here in code I have just taken a very large number in big integer which is out of range of integer to test out. So I have assigned ‘39242937852522522’ to big integer object and printed that. Following is a code for that.

using System;
using System.Numerics;

namespace ExperimentConsole
    class Program
        static void Main(string[] args)
            int n = 39242937852522522;

Let’s run code and see output like following as expected its printing value.


If you are run same program with integer it will not compile. It will give ‘Can not covert type long to integer error’. That’s it. Hope you liked it. Stay tuned for more.. Till then happy programming. Namaste!!
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Tags: C#.NET, #DOTNET, .NET,

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Alex Liked this on 9/30/2011 2:37:00 AM
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  • Either we remove the namespace or if we run same code in Vs2008 we get message as " Error Cannot implicitly convert type 'long' to 'int'. An explicit conversion exists (are you missing a cast?)"
    System.Numerics is the only namespace that comes along with .NET4 . This is good addition for developing large complex calcuation that invloces huge numbers. But in general I prefer to avoid big integers and long calculations. How abt you?

    commented on Sep 15 2011 5:50AM
    31 · 6% · 1776
  • Very good option to fix a lot of "mines" in the code

    commented on Sep 30 2011 2:38AM
    1369 · 0% · 17
  • What's the difference between this and a ulong?

    commented on Oct 6 2011 7:30PM
    2094 · 0% · 8

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"BigInteger in C# 4.0" rated 5 out of 5 by 1 readers
BigInteger in C# 4.0 , 5.0 out of 5 based on 1 ratings
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