README.md

Math Expression Evaluator

A lightweight C# math expression evaluator with lazy parsing and solving during runtime, designed to be simple and easy to use, with support for standard order of operations and commonly used functions such as logarithms, trigonometry and factorials.

Examples

// Area of a circle
var expression = new MathExpression("pi * 2^2");
var evaluation = expression.Evaluate();

// Quadratic Formula
var expression = new MathExpression("(-5 + sqrt(5^2 - 4*1*6)) / (2*1)");
var evaluation = expression.Evaluate();

// Pythagoras Theorem
var expression = new MathExpression("sqrt(3^2 + 4^2)");
var evaluation = expression.Evaluate();

// Trigonometry
var expression = new MathExpression("arccos(5/7) * 180/pi");
var evaluation = expression.Evaluate();

// Change of base
var expression = new MathExpression("log(4) / log($e)");
var evaluation = expression.Evaluate();

Supported Constants

Name	Symbol
Pi	pi
Euler's number	$e

Supported Functions

Unary Functions

Name	Symbol
Log2	lg
Log10	log
Natural Log	ln
Factorial	!
Sine	sin
Cosine	cos
Tangent	tan
Inverse Sine	arcsin
Inverse Cosine	arccos
Inverse Tangent	arctan
Hyperbolic Sine	sinh
Hyperbolic Cosine	cosh
Hyperbolic Tangent	tanh
Square Root	sqrt

Binary functions

Name	Symbol
Addition	+
Subtraction	-
Multiplication	*
Division	/
Exponentiation	^
Modulo	%

Supported Order of Operations

Name	Symbol
Open Parentheses	(
Close Parentheses	)