using System;

using System.Data;

public class Program

{

    public static void Main()

    {

        ComputeFormula("");

            ComputeFormula("2 + 2");

            ComputeFormula("2 - 2");

            ComputeFormula("4 / 2");

            ComputeFormula("10 / 0");

            ComputeFormula("-10 / 0");

            ComputeFormula("0 / 0");

            ComputeFormula("giberish");

    }

        private static void ComputeFormula(string formula)

        {

            try

            {

                using var dataTable = new DataTable();

                double computedValue =  Convert.ToDouble(dataTable.Compute(formula, null));

                Console.WriteLine($"{formula} = {computedValue}");

            }

            catch (Exception e)

            {

                Console.WriteLine($"{formula} = {e}");

            }

        }

}