using System;

using System.Collections.Generic;

​

​

public class Program

{

    public static void Main()

    {

        var operators = new Dictionary<string,Func<int,int,int>>

        {

            { "+", (a,b) => a + b },

            { "-", (a,b) => a - b },

            { "*", (a,b) => a * b },

            { "/", (a,b) => a / b }

        };

​

        var arg1 = 10;

        var arg2 = 2;

​

        foreach (var symbol in operators.Keys)

        {

            var func = operators[symbol];

            var result = func(arg1,arg2);

            Console.WriteLine("{0}{1}{2}={3}", arg1, symbol, arg2, result);

        }

    }

}