using System;

using System.Data;

​

namespace CodeChallenge9

{

    class Program

    {

        static void Main(string[] args)

        {

            evaluate("(3+3)*2+1");

            evaluate("(3+3)*(2+2)");

            evaluate("(3+3))*2+1");

            evaluate("5*((10*2)+5)");           

            evaluate("6/4");

            evaluate("1/5");

        }

        public static void evaluate(string expression)

        {

            try

            {

                Console.WriteLine(expression + " = " + Convert.ToDouble(new DataTable().Compute(expression, string.Empty)).ToString());

            }

            catch (Exception ex)

            {

                Console.WriteLine(expression + " is invalid");

            }

        }

​

​

    }

}