using System;

using System.Collections.Generic;

​

namespace CalculatorDelegate

{

    class Program

    {

        public static string usedOperator;

​

        public static void Main()

        {

            Result(int firstint, int secondint);

        }

        public static int firstInt()

        {

            Console.WriteLine("Input the first varible");

            string input = Console.ReadLine();

            int fInt;

            Int32.TryParse(input, out fInt);

            if (!Int32.TryParse(input, out fInt))

            {

                Console.WriteLine("Enter a valid integer");

                fInt = firstInt();

            }

            return fInt;

        }

        public static int Operator()

        {

            {

                Console.WriteLine("Please input an operator. Valid Opperators are: +, -, *, /");

                string input = Console.ReadLine();

                int output;

                switch (input)

                {

                    case "+":

                        output = 0;

                        usedOperator = input;

                        break;

​

                    case "-":

                        output = 1;

                        usedOperator = input;

                        break;

​

                    case "*":

                        output = 2;

                        usedOperator = input;

                        break;

​

                    case "/":

                        output = 3;

                        usedOperator = input;

                        break;

​

                    default:

                        Console.WriteLine("Please input an Opperator. Valid Opperators are: +, -, *, /");

                        output = Operator();

                        break;

                }

                return output;

            }

        }

​

        public static int secondInt()

        {

            Console.WriteLine("Input the second varible");

            string input = Console.ReadLine();

            int sInt;

            Int32.TryParse(input, out sInt);

            if (!Int32.TryParse(input, out sInt))

            {

                Console.WriteLine("Enter a valid integer");

                sInt = secondInt();

            }

            return sInt;

        }

        public static float Result(int firstInt, int secondInt)

        {

            float(Answer);

            switch (usedOperator)

            {

                case 0:

                    answer = (float)firstInt + (float)secondInt;

                    break;

​

                case 1:

                    Answer = (float)firstInt - (float)secondInt;

                    break;

​

                case 2:

                    Answer = (float)firstInt * (float)secondInt;

                    break;

​

                case 3:

                    Answer = (float)firstInt / (float)secondInt;

                    break;

​

                default:

                    Answer = 0.0f;

                    break;

            }

            return Answer;

        }

    }

}

​