var engine = new EvaluationEngine();
double result = engine.Evaluate("54 + 43 / 5 * 2");
// Also there is asynchronious version of method
double result = await engine.EvaluateAsync("123 - 5");

var engine = new EvaluationEngine();
double result = engine.Evaluate("x + 5", new {x = 10}); // 15

var engine = new EvaluationEngine();
Delegate myDelegate = engine.Compile("124 + 5");
myDelegate.DynamicInvoke(); // 129
// Or with arguments 
Delegate delegateWithArgs = engine.Compile("x + 2");
delegateWithArgs.DynamicInvoke(8.0); // 10

var engine = new EvaluationEngine();
Func<double, double> square = engine.Compile<Func<double,double>>("x^2");
square(2); // 4

var engine = new EvaluationEngine();
double result = engine.Evaluate("x*0 + 5 + 11", new {x = 10}, true); // 16

var engine = new EvaluationEngine();
engine.AddDefaultFunctions();
engine.Evaluate("sqrt(x)", new {x = 4}); // 2

var engine = new EvaluationEngine();
engine["myfunc"] = (Func<double,double>)(x => x + 5);
engine.Evaluate("myfunc(x)", new {x = 4}); // 9

var engine = new EvaluationEngine();
engine.SetCont("TwoPI", 6.28);
engine.Evaluate("TwoPI"); // 6.28

var engine = new EvaluationEngine();
engine.AddDefaultConstants();
engine.Evaluate("PI") // 3.14

public static class MyFuncs
{
  public static const double MyConst = 55;
  public static double Twice(double val) => val * 2;
}

var engine = new EvaluationEngine();
engine.Bind(typeof(MyFuncs));
engine.Evaluate("Twice(MyConst)"); // 110

var engine = new EvaluationEngine();
engine.Bind(typeof(MyFuncs), member => member.Name.ToLower());
engine.Evaluate("twice(myconst)"); // 110