using System;

public class Program

{

    public static void Main()

    {

        double a = 0;

        double b = 0;

        double result;

         Top:

        Console.WriteLine("--------------------------");

        Console.WriteLine(" Welcome to my Calculator ");

        Console.WriteLine("--------------------------");

        Console.WriteLine("Input first number");

        a=Convert.ToDouble(Console.ReadLine());

        Console.WriteLine("Enter the Operator(+,-,*,/,%)");

        string op = Console.ReadLine();

        Console.WriteLine("Input second number");

        b=Convert.ToDouble(Console.ReadLine());

​

        switch (op)

        {

            case "+":

                result = a + b;

                Console.WriteLine("Answer:" + (a+b));

                Console.WriteLine("\n");

                Console.WriteLine("ENTER TO GO BACK");

                Console.ReadLine();

                Console.Clear();

                goto Top;

            case "-":

                result = a - b;

                Console.WriteLine("Answer:"+ (a-b));

                Console.WriteLine("\n");

                Console.WriteLine("ENTER TO GO BACK");

                Console.ReadLine();

                Console.Clear();

                goto Top;

            case "*":

                result = a * b;

                Console.WriteLine("Answer:"+ (a*b));

                Console.WriteLine("\n");

                Console.WriteLine("ENTER TO GO BACK");

                Console.ReadLine();

                Console.Clear();

                goto Top;

​

​

            case "/":

                result = a / b;

                Console.WriteLine("Answer:"+ (a/b));

                Console.WriteLine("\n");

                Console.WriteLine("ENTER TO GO BACK");

                Console.ReadLine();

                Console.Clear();

                goto Top;

            case "%" :

                result = a % b;

                Console.WriteLine("Answer:"+ (a%b));

                Console.WriteLine("\n");

                Console.WriteLine("ENTER TO GO BACK");

                Console.ReadLine();

                Console.Clear();

                goto Top;

​

    }

  } 

}