How to evaluate a math expression contained in a string?

[Juan]

If I have a string with a valid math expression like " (2 + 28)/1", how can
I evaluate it?



Thanks,

Juan.

[Amiram Korach]

RE: How to evaluate a math expression contained in a string?

You can always work hard and write it yourself, but I think you are not the
first to meet this. I found something in CodeProject:

http://www.codeproject.com/vb/net/math_expression_evaluator.asp

I you search yourself, I'm sure you'll find more.

"Juan" wrote:
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> If I have a string with a valid math expression like " (2 + 28)/1", how can
> I evaluate it?
>
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> Thanks,
>
> Juan.
>
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>
>[/color]

[James Curran]

Re: How to evaluate a math expression contained in a string?

Try the .Math library:
http://hebertsoft.com/dotmath/ (Note, he's moving the downloads from
http://workspaces.gotdotnet.com/math to
https://sourceforge.net/projects/dotmath/, but is still in the process)



"Juan" <juan_mauricio_ lopez@ANTISPAMh otmail.com> wrote in message
news:uSraggvBFH A.1296@TK2MSFTN GP10.phx.gbl...[color=blue]
>
>
>
> If I have a string with a valid math expression like " (2 + 28)/1", how[/color]
can[color=blue]
> I evaluate it?[/color]

[Jako Menkveld]

Re: How to evaluate a math expression contained in a string?

I'm not sure how safe this is, but I used this in a non-production
environment and it works quite well:


"Amiram Korach" <AmiramKorach@d iscussions.micr osoft.com> wrote in message
news:64F416D0-9314-47F8-B84D-3A2BFF0484B9@mi crosoft.com...[color=blue]
> You can always work hard and write it yourself, but I think you are not
> the
> first to meet this. I found something in CodeProject:
> http://www.codeproject.com/vb/net/ma..._evaluator.asp
> I you search yourself, I'm sure you'll find more.
>
> "Juan" wrote:
>[color=green]
>>
>>
>>
>> If I have a string with a valid math expression like " (2 + 28)/1", how
>> can
>> I evaluate it?
>>
>>
>>
>> Thanks,
>>
>> Juan.
>>
>>
>>
>>[/color][/color]

[Jako Menkveld]

Re: How to evaluate a math expression contained in a string?

Sorry about that, here's the code:

------------------------------------------------------------------------------
using System;

using Microsoft.JScri pt;
using Microsoft.JScri pt.Vsa;

namespace VPDBUtils
{
public class JScriptEvaluato r
{
private static VsaEngine vsaEngine;

public static void Initialize()
{
vsaEngine = VsaEngine.Creat eEngine();
}

public static void Close()
{
if (vsaEngine != null)
{
vsaEngine.Close ();
}
}

private static object EvaluateString( string sStringToEvalua te)
{
return Eval.JScriptEva luate(sStringTo Evaluate, vsaEngine);
}

internal static double EvaluateStringA sDouble(string sStringToEvalua te)
{
return System.Convert. ToDouble(Evalua teString(sStrin gToEvaluate));
}
}
}
------------------------------------------------------------------------------


First you call the static Initialise, the pass your string to
EvaluateStringA sDouble() and it gives you the result back as a double.


"Amiram Korach" <AmiramKorach@d iscussions.micr osoft.com> wrote in message
news:64F416D0-9314-47F8-B84D-3A2BFF0484B9@mi crosoft.com...[color=blue]
> You can always work hard and write it yourself, but I think you are not
> the
> first to meet this. I found something in CodeProject:
> http://www.codeproject.com/vb/net/ma..._evaluator.asp
> I you search yourself, I'm sure you'll find more.
>
> "Juan" wrote:
>[color=green]
>>
>>
>>
>> If I have a string with a valid math expression like " (2 + 28)/1", how
>> can
>> I evaluate it?
>>
>>
>>
>> Thanks,
>>
>> Juan.
>>
>>
>>
>>[/color][/color]