Improve company productivity with a Business Account.Sign Up

x
?
Solved

How to convert a 39-decimal characters into hex in c#

Posted on 2013-11-06
4
Medium Priority
?
1,152 Views
Last Modified: 2013-11-06
Hi experts
I've a string representation of a 39-characters long decimal integer.
I need to convert this into hex format in C#.
eg. 340282366920938463463374607431768211455 (39 characters)
      -> ffffffffffffffffffffffffffffffff (32 characters)

By the same token, I need to be able to reverse the operation from hex to decimal.

I am using C# .NET 3.5 which hasn't got BigInteger.

Any advice please.  Thanks in advance.
0
Comment
Question by:dominicwong
  • 2
4 Comments
 
LVL 9

Accepted Solution

by:
QuinnDex earned 2000 total points
ID: 39629440
the code for doing this in strings is below but if you want to work in numbers try intX

https://github.com/devoyster/IntXLib


decimal string to hex string

        var s = "843370923007003347112437570992242323";
        var result = new List<byte>();
        result.Add( 0 );
        foreach ( char c in s )
        {
            int val = (int)( c - '0' );
            for ( int i = 0 ; i < result.Count ; i++ )
            {
                int digit = result[i] * 10 + val;
                result[i] = (byte)( digit & 0x0F );
                val = digit >> 4;
            }
            if ( val != 0 )
                result.Add( (byte)val );
        }

        var hex = "";
        foreach ( byte b in result )
            hex = "0123456789ABCDEF"[ b ] + hex;

Open in new window



hex string to decimal string

static string HexToDecimal(string hex)
{
    List<int> dec = new List<int> { 0 };   // decimal result

    foreach (char c in hex)
    {
        int carry = Convert.ToInt32(c.ToString(), 16);   
            // initially holds decimal value of current hex digit;
            // subsequently holds carry-over for multiplication

        for (int i = 0; i < dec.Count; ++i)
        {
            int val = dec[i] * 16 + carry;
            dec[i] = val % 10;
            carry = val / 10;
        }

        while (carry > 0)
        {
            dec.Add(carry % 10);
            carry /= 10;
        }
    }

    var chars = dec.Select(d => (char)('0' + d));
    var cArr = chars.Reverse().ToArray();
    return new string(cArr);
}

Open in new window

0
 
LVL 40
ID: 39629453
There is a BigInteger. It is "hidden" in the System.Numerics namespace, available after referencing the dll by the same name.

If you can get a string representation of your value, the following will do the job:

BigInteger bigInt = BigInteger.Parse ( "340282366920938463463374607431768211455" );
string bigHex = bigInt.ToString ("X");
bigInt = BigInteger.Parse ( bigHex, System.Globalization.NumberStyles.HexNumber );

Otherwise, give a look at the BigInteger Structure in the documentation, it is quite exhaustive.
0
 
LVL 9

Expert Comment

by:QuinnDex
ID: 39629466
BigInteger is part of .net 4, OP is working with .net 3.5
0
 

Author Closing Comment

by:dominicwong
ID: 39629467
Thanks QuinnDex. That works like a charm, and is exactly what I need.

Thanks also to JamesBurger for your help.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Entity Framework is a powerful tool to help you interact with the DataBase but still doesn't help much when we have a Stored Procedure that returns more than one resultset. The solution takes some of out-of-the-box thinking; read on!
High user turnover can cause old/redundant user data to consume valuable space. UserResourceCleanup was developed to address this by automatically deleting user folders when the user account is deleted.
In this video I will demonstrate how to set up Nine, which I now consider the best alternative email app to Touchdown.
Watch the video to know how one can repair corrupt Exchange OST file effortlessly and convert OST emails to MS Outlook PST file format by using Kernel for OST to PST converter tool. It can convert OST to MSG, MBOX, EML to access them. It can migrateā€¦

607 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question