how can i convert hexadecimal value to biginteger?

Question

I mean how can I convert my hexadecimal values to biginteger ?

for example i use this :

string value="A1";
BigInteger bi=new BigInteger(value,16);

bi =161; this is true? So how can I convert back it to "A1"?

thanks..

Little bit confused which BigInteger you use that has this constructor — meandmycode, May 20 '12 at 19:43
@ErsinGülbahar - The answers you have gotten are about `System.Numerics.BigInteger` that is in the .NET 4.0 framework library. Are you using a different one? If so, which one (links please). — Oded, May 20 '12 at 19:52
In your [last question](http://stackoverflow.com/questions/10624815/how-can-i-use-bigint-with-c) 4 answers recommended using `BigInteger` from the .NET framework library. Why didn't you use that? — Oded, May 20 '12 at 20:19
@meandmycode The Java class BigInteger has such a constructor. — user1938742, Oct 14 '15 at 08:13

Pencho Ilchev · Accepted Answer · 2012-05-20T20:17:52.453

2

String.Format supports this:

String.Format("0:x", 161);

Working example:

        string value="A1";
        BigInteger bi = BigInteger.Parse(value, NumberStyles.HexNumber);
        string newVal = string.Format("{0:x}", bi);
        //newVal is a1

UPDATE: The above suggestion is valid for the BigInteger implementation in the System.Numerics namespace of .NET

edited May 20 '12 at 20:17

answered May 20 '12 at 19:42

Pencho Ilchev

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I do not have Parse method. ? – CompEng May 20 '12 at 19:54
@ErsinGülbahar - I will ask again. Where does the `BigInteger` class you are using coming from? Please provide a link. – Oded May 20 '12 at 19:58
@ErsinGülbahar have you tagged your question wrongly. You probably meant to tag it with the java tag? – Pencho Ilchev May 20 '12 at 20:02
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@PenchoIlchev - He may have meant this: http://www.codeproject.com/Articles/2728/C-BigInteger-Class – Oded May 20 '12 at 20:03
@Oded Could be since he cannot find the BigInteger.Parse method but seems to have no problem finding string.Format – Pencho Ilchev May 20 '12 at 20:07
@PenchoIlchev - `String.format` is how you would do it in Java, so it _may_ be Java as well. Or something else. Without confirmation from the OP, there is no way to know. – Oded May 20 '12 at 20:09
The implementation in the code project have ToHexString method. – Pencho Ilchev May 20 '12 at 20:11
It might have been this one: http://biginteger.codeplex.com/releases/view/16762 - it was linked to from his last question. – Oded May 20 '12 at 20:20
@Oded This one also has ToHexString method which uses StringBuilder.AppendFormat – Pencho Ilchev May 20 '12 at 20:24

score 1 · Answer 2 · edited May 20 '12 at 19:41

1

To convert back the BigInteger to hexadecimal string you can do in this way :

string value= bi.ToString("X");

edited May 20 '12 at 19:41

Tim Schmelter

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answered May 20 '12 at 19:40

aleroot

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it is error me. like this : The best overloaded method match for 'BigInteger.ToString(int)' has some invalid argument – CompEng May 20 '12 at 19:45

score 1 · Answer 3 · answered May 20 '12 at 19:41

1

ToString is overridden in BigInteger:

bi.ToString("X")

answered May 20 '12 at 19:41

Oded

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it is error me. like this : The best overloaded method match for 'BigInteger.ToString(int)' has some invalid arguments – CompEng May 20 '12 at 19:42
@ErsinGülbahar - Where are you finding an override that takes an `int`? Post the _exact_ code you are trying. Also - stop posting the exact same comment to everyone who answered. It is annoying. – Oded May 20 '12 at 19:43

how can i convert hexadecimal value to biginteger?

3 Answers3