using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication3

{

    class Program

    {

        delegate double ProcessDelegate(double param1, double param2);

        //委托定义

        static double Multiply(double param1,double param2)

        {

            return param1 * param2;

        }

        static double Divide(double param1, double param2)

        {

            return param1 / param2;

        }

        static void Main(string[] args)

        {

            ProcessDelegate process;

            Console.WriteLine("Enter 2 numbers separated with a comma:");

            //输入两个数，用逗号隔开.

            string input = Console.ReadLine();

            int commaPos = input.IndexOf(',');

            //获取逗号字符所在的位置

            //获取两个数

            double param1 = Convert.ToDouble(input.Substring(, commaPos));

            double param2 = Convert.ToDouble(input.Substring(commaPos + , input.Length - commaPos - ));

            //输入M代表multiply , D代表divide

            Console.WriteLine("Enter M to multiply or D to divide:");

            input = Console.ReadLine();

            if (input == "M")

                process = new ProcessDelegate(Multiply);

            else

                process = new ProcessDelegate(Divide);

            Console.WriteLine("Result: {0}.",process(param1,param2));

            Console.ReadKey();

        }

    }

}