Math Parser .NET C#

• Download demo - 400.7 KB 
• Download MathParserTK_1_4.zip - 21.2 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 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: 

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