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Math Parser .NET C#

, 28 Feb 2014 GPL3
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This is light, fast and simple to understand mathematical parser designed in one class, which receives as input a mathematical expression (System.String) and returns the output value (System.Double)

Introduction    

This is light, fast and simple to understand mathematical parser designed in one class, which receives as input a mathematical expression (System.String) and returns the output value (System.Double). For example, if your input string is "√(625)+25*(3/3)" then parser returns double value — 50. 

Background   

The idea was to create a string calculator for educational goals.  

How it work   

 

For more please look at the code, I tried to explain the work of the parser in the comments and how it can be changed and extended.  

Convert to RPN:

* Input operators are replaced by the corresponding token (its necessary to distinguish unary from binary). 

Using the code  

Example:    

    public static void Main()
    {     
            MathParser parser = new MathParser();
	    string s1 = "pi+5*5+5*3-5*5-5*3+1E1";
	    string s2 = "sin(cos(tg(sh(ch(th(100))))))";
            bool isRadians = false;
            double d1 = parser.Parse(s1, isRadians);
	    double d2 = parser.Parse(s2, isRadians);

            Console.WriteLine(d1); // 13.141592...
	    Console.WriteLine(d2); // 0.0174524023974442
            Console.ReadKey(true); 
    }  

Features  

Ariphmetical operators :

  • () — parentheses;  
  • + —  plus (a + b); 
  • - — minus (a - b); 
  • * — multiplycation symbol (a * b); 
  • / — divide symbol (a / b); 
  • ^ — degree symbol (a ^ b).  

Functions :    

Trigonometric functions: 

  • sin(x);
  • cos(x);
  • tg(x);  
  • ctg(x). 

Hyperbolic functions:

  • sh(x);
  • ch(x);
  • th(x).  

Other functions: 
  • √(a), sqrt(a) — square root of a number; 
  • exp(x)  — exponential function (or just use e^x);  
  • (a)log(b) — logarithm; 
  • ln(x) — natural logarithm; 
  • abs(x) — absolute value.  

Constants:

  • pi — 3.14159265...;  
  • e — 2.71828183....  

Arguments of the trigonometric functions can be expressed as radians (true) or degrees (false) by sending appropriate bool value to parse method. Example (as radians):   

parser.Parse("sin(90)", true);

Work with any char decimal separator in real number (regional settings).

New operators, functions and constants can be easily added to the code. 

This parser is simple (special designed in single class), convenient for the further implementation, expansion and modification.      

Points of Interest     

I better understand how parsers work and learned about the reverse-polish notation.

History

  • 2012/05/09: released the source code (1_0); 
  • 2012/06/07: optimized parser (1_2);    
  • 2014/02/28: rewritten version (1_4). 

License

This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)

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About the Author

kirnbas

Kazakstan Kazakstan
My full name is Yerzhan Kalzhani. I’m a pragmatic software developer who loves tasks that are interesting and challenging. My motto in software developing: "Quality, Performance and Agile".
 
I prefer systematic approach when solving problem, so I think that every good developer first of all should be able to manage the complexity of a software system and produce the well-structured solution for a poor defined problem.

Comments and Discussions

 
GeneralGreat Job! Pinmembermiro125-Mar-14 4:03 
GeneralRe: Great Job! Pinmemberkirnbas24-Mar-14 6:35 
GeneralMy vote of 4 PinmemberFlorian Rappl29-Aug-12 9:50 
GeneralRe: My vote of 4 Pinmemberkirnbas29-Aug-12 20:34 
GeneralRe: My vote of 4 PinmemberFlorian Rappl29-Aug-12 22:27 
GeneralRe: My vote of 4 PinmemberAndreas Gieriet27-Jan-13 9:19 
AnswerCode PinmemberClifford Nelson24-Aug-12 8:07 
GeneralRe: Code Pinmemberkirnbas24-Aug-12 8:46 
NewsSym PinmemberWarren Harding16-Aug-12 21:32 
GeneralRe: Sym Pinmemberkirnbas24-Aug-12 7:19 
QuestionBroken Image links PinmemberMarcus Kramer7-Jun-12 5:53 
AnswerRe: Broken Image links Pinmemberkirnbas7-Jun-12 6:32 
GeneralPlease show and explain the code PinmemberPIEBALDconsult14-May-12 14:51 
GeneralRe: Please show and explain the code Pinmemberkirnbas15-May-12 3:22 
GeneralRe: Please show and explain the code PinmemberPIEBALDconsult15-May-12 8:03 
SuggestionQuite complicated expression evaluator... PinmemberAndreas Gieriet14-May-12 13:18 
QuestionYou might want to elaborate on some of the inner workings, etc. Pinmemberednrg14-May-12 9:07 

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