Math Parser .NET C#

• Download demo - 400.5 KB 
• Download MathParserTK_1_3.zip - 97 KB 

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 you input string is "√(625)+25*(3/3)" then parser return double value — 50. 

Background  

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

How it work  

More look in the code, I tried to explain the work of the parser code 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 :

• () — parenthesis; 
• + —  plus (a + b); 
• - — minus (a - b); 
• * — multiplycation symbol (a * b); 
• / — divide symbol (a / b); 
• ^ — degree symbol (a ^ b); 
• √(), sqrt() — square root ( √(a) ). 

Functions : 

Trigonometric functions: 

parser.Parse(s, true);