Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/giorgi/math-expression-evaluator

A C# library for parsing mathemitical expressions with support for parentheses and variables.
https://github.com/giorgi/math-expression-evaluator

c-sharp expression-evaluator math-expression-evaluator netstandard netstandard20

Last synced: 2 days ago
JSON representation

A C# library for parsing mathemitical expressions with support for parentheses and variables.

Awesome Lists containing this project

README

        

# Math Expression Evaluator

[![NuGet Downloads](https://img.shields.io/nuget/dt/Math-Expression-Evaluator?style=for-the-badge)](https://www.nuget.org/packages/Math-Expression-Evaluator/)
[![NuGet Version](https://img.shields.io/nuget/v/Math-Expression-Evaluator?style=for-the-badge)](https://www.nuget.org/packages/Math-Expression-Evaluator/)

## Usage

Math Expression Evaluator is a library for evaluating simple mathematical expressions. It supports simple expressions such as `2.5+5.9`, `17.89-2.47+7.16`, `5/2/2+1.5*3+4.58`, expressions with parentheses `(((9-6/2)*2-4)/2-6-1)/(2+24/(2+4))` and expressions with variables:

``` csharp

var a = 6;
var b = 4.32m;
var c = 24.15m;
Assert.That(engine.Evaluate("(((9-a/2)*2-b)/2-a-1)/(2+c/(2+4))", new { a, b, c}),
Is.EqualTo((((9 - a / 2) * 2 - b) / 2 - a - 1) / (2 + c / (2 + 4))));
```
It is also possible to specify variables by using named arguments like this:

``` csharp

dynamic dynamicEngine = new ExpressionEvaluator();

var a = 6;
var b = 4.5m;
var c = 2.6m;
Assert.That(dynamicEngine.Evaluate("(c+b)*a", a: 6, b: 4.5, c: 2.6),
Is.EqualTo((c + b) * a));
```

## Installation

```
dotnet add package Math-Expression-Evaluator
```

## User Feedback

From https://stackoverflow.com/questions/50722680/methods-for-dynamically-creating-an-array-in-c-sharp

DavidG
> Can't decide if this library is evil, genius or evil genius...

xanatos
> That library is using high level magic... Very high level :-)

> The class is dynamic and is handling in a dynamic way the use of the method... fascinating