VS2005 - C# - Math?

Posted on 2007-11-14
Last Modified: 2011-10-03
I have a C# Windows app that performs calculations based on equation patterns.  Currently I'm leveraging MS SQL Server's built in abilities to perform the actual calculations.  Here are some of the equation patterns that are being sent to the database:

(A * (B - C)) + (D * (E - F))
(A * B) + (A * C)
(A * B) + (A * C) + (D * E)
(A * B) + (A * C) + (D * E) + (D * F)
(A * B) + (C * (D - E))
(A * B) + (C * D)
(A*B) - C
(A-B) * C
(CEILING((A - B)/C) * D)
(CEILING(A - B)/C) * D
(CEILING(A/B) * C) + (A * D)
(CEILING(A/B) * C) + (A * D) + (CEILING(E/F) * G)
(CEILING(A/B) * C) + (D * E)
A * (B - C)
A * B
A + (((B - C)/D) * E)
A + (B * (C - D))
A + (B * C)
CEILING((A - B)/C) * D

The values for the elements ('A', 'B', 'C' etc) are values determined by input from the user and/or static values stored in the database and all have a potential for four significant digits (I stated that poorly but you know what I mean right?).  

I'm wondering if there is an open source or near free .net library out there somewhere that can execute full equations like these without major modifications.

The app works great and may move to aspx soon so maybe it's best to keep using SQL Server's math abilities?  What do you folks think?
Question by:wpm0001
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 25

Expert Comment

ID: 20286461
C# should be able to handle all those calculations natively, or am I missing something? can you elaborate?
LVL 22

Expert Comment

ID: 20286501
I don't think this does everything you want, but still of interest

Author Comment

ID: 20286639

I would like to send an entire equation to "something" and have it evaluate the expression without needing to do anything else.  

For the pattern:
(A * B) + (A * C) + (D * E) + (D * F)

SQL Server Accepts:
(5.0000 * 6.0000) + (5.0000 * 0.0125) + (3.0000 * 4.3180) + (3.0000 * 7.0000)

And will return the appropriate value.  SQL Server will accept any valid mathematical statement and return the calculated value.  If C# can do this then I've missed it!  I really hope that I've missed it because it would be awesome!!!

BTW - these equation patterns (that is what I'm call'in them) are stored in a database and the pattern is not known until run-time.  The app picks out the elements that can be entered, etc.

I might not have answered your question.  I tend to be a little wordy sometimes...
Turn Insights into Action

Communication across every corner of your business is essential to increase the velocity of your application delivery and support pipeline. Automate, standardize, and contextualize your communication processes with xMatters.

LVL 25

Expert Comment

ID: 20286653
how about:

paste the entire calculation as c# code, compile and run it
LVL 25

Expert Comment

ID: 20286656
actually, this one is easier, and straight from the horse's mouth
LVL 25

Expert Comment

ID: 20286711
that was incomplete, you need this also

so your compiled exe has

void main...
 writeline ... (string) (5.0000 * 6.0000) + (5.0000 * 0.0125) + (3.0000 * 4.3180) + (3.0000 * 7.0000) )

and your original app receives the result in

string sRes = oReader2.ReadToEnd();

and casts as double

Author Comment

ID: 20286748

Holy Cow - way above my head!  Interesting though.  


Author Comment

ID: 20286847

If the values changed - then what?  

I must be missing something...  (A * B) + (A * C) + (D * E) + (D * F)

In a situation where A, B, C, D, E, and/or F can have different values based on the input from the user how do your posts apply?

You have me confused now.  
LVL 22

Expert Comment

ID: 20286928
It's really pretty simple to do. Just convert it to Reverse Polish Notation and run it through a simple stack processor. Send in the values for the variables along with the equations.

LVL 25

Accepted Solution

imitchie earned 250 total points
ID: 20287124
let's say you are passing a string to be evaluated by SQL Server, and getting the results via 'Select ' + MyEquation
you can create a template single-file C# console program to evaluate an equation, and write it to the console. it could have a simple equation like console.write( (string) (2+3+4) ).
you then take the whole file as a string x = ... C# console program.
then depending on the input, you update the equation, i.e.
  string myconsoleapp = "..... upto write( (string) ( Ceiling(" + A + " + " + B + ") ) .... rest of program"
then you can use the SharpCompiler to compile it, and use Process.Start to run it.  Read the console output back

you can use the same pattern for more than just equations.

Featured Post

Raise the IQ of Your IT Alerts

From IT major incidents to manufacturing line slowdowns, every business process generates insights that need to reach the people required to take action. You need a platform that integrates with your business tools to create fully enabled DevOps toolchains.

You need xMatters.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
Recently we ran in to an issue while running some SQL jobs where we were trying to process the cubes.  We got an error saying failure stating 'NT SERVICE\SQLSERVERAGENT does not have access to Analysis Services. So this is a way to automate that wit…
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
Viewers will learn how to use the SELECT statement in SQL and will be exposed to the many uses the SELECT statement has.

689 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question