using System;

​

namespace Y2VC18

{

    public static class Calc

    {

        #region Methods

        public static double Add(double x, double y)

        {

            return x + y;

        }

        public static double Sub(double x, double y)

        {

            return x - y;

        }

        //Add Multiply method

        //Add Divide method

        //Add Square method

        #endregion

    }

    public class Program

    {

        public static void Main(string[] args)

        {

            var result = Calc.Add(2, 5);

            Console.WriteLine(result);

        }

    }

}

​