Equivalent to eval() function in java

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Hi im trying to evaluate below statement in vb.net but i don't know how to do that so anyone can help
me ?

JavaScript

var code = eval("(0x4247f4e627ca7065145406ab01f7f7e3)");
alert(code);

and got the result "8.810266794149574e+37"

I want this to be done in .NET

Update:

C#

function getPoW(a, b) {
        var c = 0;
        do hash_hex = md5(md5(b + c)), hash = eval("(0x" + hash_hex + ")"), ++c; while (hash >= a);
        return c
}

Thanks in advance :)

Posted 16-Nov-13 0:14am

nazarinlaw

Updated 16-Nov-13 1:29am

v3

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OriginalGriff · Accepted Answer · 2013-11-16T00:29:00

Solution 1

You are pretty much on a loser there - .NET does not easily support numbers larger than int64 - and that is an int128, which won't even fit in a decimal...

There is the BigIntger class:

VB

Dim hexString As String = "4247f4e627ca7065145406ab01f7f7e3"
Dim bi As BigInteger = BigInteger.Parse(hexString, System.Globalization.NumberStyles.HexNumber)

But whether that is useful to you depends on what you are planning on doing with the data...

Posted 16-Nov-13 0:29am

OriginalGriff

Updated 16-Nov-13 0:30am

v2

Comments

nazarinlaw 16-Nov-13 6:35am

Thank you bro, sorry for that, i didn't know that :)

OriginalGriff 16-Nov-13 6:37am

You're welcome!

nazarinlaw 16-Nov-13 6:38am

Is there anyway can i convert this "8.810266794149574e+37" into "88102667941495738829884669591129946083" ?

nazarinlaw 16-Nov-13 6:45am

Just figured it out ! thank you though :)

OriginalGriff 16-Nov-13 6:56am

You're welcome!

nazarinlaw 16-Nov-13 7:08am

Hello mate, have a tiny problem with the convert, I converted those long code into double and i get '8.81026679414957E+37' but the java result '8.810266794149574e+37'. Any ideas bro ?

OriginalGriff 16-Nov-13 7:23am

Probably not, or not easily - double is a 64 bit floating point number, so it only stores 15/16 decimal digits - I'm not sure what the java value is based on so I can't comment on it's size, but I would have thought it would be the same.
What did you use to convert the value in the end? That may be relevant.

OriginalGriff 16-Nov-13 7:33am

There is always the "brute force and ignorance" approach :laugh:
Dim hexString As String = "4247f4e627ca7065145406ab01f7f7e3"
Dim bi As BigInteger = BigInteger.Parse(hexString, System.Globalization.NumberStyles.HexNumber)
Dim decimalValue As String = bi.ToString()
Dim characteristic As String = decimalValue.Substring(0, 1)
Dim mantissa As String = decimalValue.Substring(1)
Dim exponentVersion As String = String.Format("{0}.{1}e+{2}", characteristic, mantissa, mantissa.Length)
Ugly? Yes.
Effective? Yes.
Works with any size hex value? Yes...pretty much! :laugh:

If all you want to do is print it, then this could be a viable option:
8.8102667941495738829884669591129946083e+37

nazarinlaw 16-Nov-13 7:33am

I updated the question bro ! i just want to convert that into vb.net.

nazarinlaw 16-Nov-13 7:34am

oh let me look at your code bro !

nazarinlaw 16-Nov-13 7:55am

Sorry to bother you mate looks like this value is different from both java and vb.net "8b5b3afc7d854d1597014042e14577ee" on hexnumber !

nazarinlaw 16-Nov-13 8:02am

I think i just figured it out mate, just add 0 :) thank alot for your help ! much appreciated !
have a nice day and pleased to meet you bro :)

OriginalGriff 16-Nov-13 8:20am

You're welcome!

nazarinlaw 16-Nov-13 8:03am

Voted !! thumps up :P

Equivalent to eval() function in java

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