using System;

​

namespace Y2C15_2

{

    public static class Mathmatics

    {

        #region Methods

        public static double Add(double x, double y)

        {

            return x + y;

        }

        public static double Subtract(double x, double y)

        {

            return x - y;

        }

        public static double Multiply(double x, double y)

        {

            return x * y;

        }

        public static double Divide(double x, double y)

        {

            return x / y;

        }

        public static double Sqaure(double x)

        {

            return x * x;

        }

        public static double Squareroot(double x)

        {

            var result = Math.Sqrt(x);

            return result;

        }

        #endregion

​

    }

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Hello World!");

        }

    }

}

​