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Expression Evaluator (that is - STRING CALCULATOR) |
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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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Terms of Agreement:
By using this code, you agree to the following terms...
1) You may use
this code in your own programs (and may compile it into a program and distribute it in compiled format for langauges that allow it) freely and with no charge.
2) You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.
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4) You will abide by any additional copyright restrictions which the author may have placed in the code or code's description. |
Other 13 submission(s) by this author
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| Your Vote! |
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| Other User Comments |
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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