using System;

using org.matheval;

public class Program

{

    public static void Main()

    {

        Expression expr = new Expression("SUM(a,b,c)");

        expr.Bind("a", 2d);

        expr.Bind("b", 3d);

        expr.Bind("c", 16d);

        Double sum = expr.Eval<Double>(); // return 21

        Console.WriteLine("sum: "+sum);

        expr.SetFomular("AVERAGE(a,b,c)");

        Double avg = expr.Eval<Double>(); // return 7       

        Console.WriteLine("avg: "+avg);

    }

}