using System;

​

namespace Calculator

{

​

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Calculator Version 2");

            Start:

            int Operator = 0;

            float Num1 = 0;

            float Num2 = 0;

            float finNum = 0;

            string CurrentLine = "0";

​

            Console.WriteLine(string.Empty);

            Console.WriteLine(string.Empty);

            Console.WriteLine("Add(1), Sub(2), Muilti(3), or Div(4)");

            Int32.TryParse(Console.ReadLine(), out Operator);

            if (Operator < 1 || Operator > 4)

            {

                Console.WriteLine("Enter Number Between 1-4");

                Console.WriteLine(string.Empty);

                Console.WriteLine(string.Empty);

                goto Start;

            }

            Console.WriteLine("Enter Number 1");

            CurrentLine = Console.ReadLine();

            float.TryParse(CurrentLine, out Num1);

​

​

            enternum2:

            Console.WriteLine(string.Empty);

            Console.WriteLine("Enter Number 2");

            CurrentLine = Console.ReadLine();

            float.TryParse(CurrentLine, out Num2);

            if (Operator == 1)

            {

                finNum = Num1 + Num2;

                Console.WriteLine("Your Anwser is " + finNum);

            }

            else if (Operator == 2)

            {

                finNum = Num1 - Num2;

                Console.WriteLine("Your Anwser is " + finNum);

            }

            else if (Operator == 3)

            {

                finNum = Num1 * Num2;

                Console.WriteLine("Your Anwser is " + finNum);

            }

            else if (Operator == 4)

            {

                if (Num2 == 0)

                {

                    Console.WriteLine("ERROR DIV 0");

                    goto enternum2;

                }

                finNum = Num1 / Num2;

                Console.WriteLine("Your Anwser is " + finNum);

            }

            else

            {

                goto Start;

            }

            Console.WriteLine(string.Empty);

            Console.WriteLine(string.Empty);

            goto Start;

        }

    }

}