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Ever wanted to have a program, that will calculate the value of a given expression? (like you give it "2*3^sin(2)+23/(2*Abs(-8.5)" and it returns the value). Well HERE IT IS - My 'EVALUATOR' class. You may search all over, noone will give you such source (at least I didn't find). :) ('Eat MY code...':)
---Also, read the README.TXT File in the Zip. Thanx!
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By using this code, you agree to the following terms...
- You may use
this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.
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Other 10 submission(s) by this author
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Other User Comments
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 12/14/1999 8:52:19 AM: Robert
mvervi, this would be good if you distributed a program to a user that did not have Excel.
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12/14/1999 11:59:10 AM: Bart Hermans
Thank you very very much man!!! I've been working on such a class for a very long time now, and I must say it isn't easy!!!
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12/14/1999 1:23:45 PM: Konstantin
mvervi, I don't understand this logic.
1) I made this for the ALGORITHM itself.
2) Excel loads for hours...(and costs much)
3) Besides, if you make a calculator app, I will ask you: "Why do you make it - there is one in Windows" ,and so with nearly every program...
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12/15/1999 3:28:51 AM: Javier Martin
Hi Konstantin, Very good work!
mvervi, there are so much applications where is absolutely mandatory to have modules like this ...
Javier
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12/15/1999 7:06:08 PM: Reb
Great job! Makes it very easy to write a scripting language. This is the most useful code I've seen in awhile.
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1/2/2000 2:08:39 AM: Kevino
I also submitted an expression parser a while back, if anyone is interested in this. Just do a search for "3D Mathematical Plot". I have an equation solver to go along with it.
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1/5/2000 4:52:49 PM: Philip Leitch
Cool code... just one little fixer upper, in the function CalcFunction, PI is stated as a number (because VB does not have a PI constant). However, it can be acurately calculated by using the arc tangent (so I am a maths buff). So, it should read:
Case "PI"
CalcFunction = 4 * Atn(1)
Cheers.... and again, cool code.
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1/5/2000 5:25:22 PM: Konstantin Tretyakov
Yeah, right, from the point of math it is cool to calculate the PI from ATN, but from the point of programming it will be better not to make the calculation. PI is a constant and (if I'm not mistaken) I gave it with the best precision VB can handle.
If it is not enough: PI=3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211 70679...
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2/10/2000 12:59:50 PM: Jason
Cool Code Konstantin,
This is just what I was looking for.
Jason.
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5/17/2000 6:29:00 PM: Brian
One problem: try this -2^2 gives -4; it should give 4
-2^2 = -2*-2 = 4
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5/17/2000 7:26:46 PM: kt
Brian, that's not a problem, everything is correct here. (-2)^2 is 4, but -2^2=-(2^2)=-4.
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5/25/2000 9:04:50 PM: Vanessa
This code is great. I have been trying to find something that will convert text formulas into a result and this does it just fine. Had found others, but they didn't handle brackets. Thanks for this, it will save me a lot of time.
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9/11/2001 11:47:11 AM: Mark Hunter
Great code! Truly useful.
One suggestion for enhancement would be to evaluate expressions like:
3x^2+2x
This can be done with the current class only with the syntax:
3*x^2+2*x
Which might not be immediately intuitive. Maybe the class could add the "*" automatically when necessary.
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1/30/2002 5:36:17 PM: David
Exactly what I was looking for! Great job, Konstantin!
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5/28/2003 12:11:30 AM:
Thank you, I have been lokking for some code like this for a long time, but none of the modules I tried worked. However, I was wondering if their is some way to put the result into a text box instead of in a msgbox.
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6/1/2004 4:01:51 PM: Guido Vrijdag
Have you ever used the Microsoft Scripting Control? With that control you can script everything (not only math expression, but complete scripts in vbscript or jscript). Yet glad to see that not everyone is as lazy as I am. Still a look at msdn for the control is really worthwhile.
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6/2/2004 1:03:46 AM: Rilov
Brother please try this code instead of your tedious class.
for evaluating an expression
Dim test As New ScriptControl
test.Language =
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6/2/2004 1:07:44 AM: Rilov
Dim test As New ScriptControl
test.Language = "VBScript"
MsgBox test.Eval(evaluationstring)
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8/16/2006 3:36:57 AM: Richard Mewett
Very nice little class. This one may be old but its good! :) *****
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