using System;

public class Program

{

    public static void Main()

    {

        while (true) {

            Console.WriteLine("Choose an operator: Addition, Subtraction, Multiplication, Division, Modulo");

            string opChoice = Console.ReadLine();

            if (opChoice == "Exit") {

                Console.WriteLine("Exiting the program.");

                break; }

            else if (opChoice != "Addition" && opChoice != "Subtraction" && opChoice != "Multiplication" && opChoice != "Division" && opChoice != "Modulo") {

                Console.WriteLine("Invalid operator choice. Try Again.");

                continue; }

            Console.WriteLine("Enter the first operand: ");

                int x = int.Parse(Console.ReadLine());

            Console.WriteLine("Enter the second operand: ");

                int y = int.Parse(Console.ReadLine());

            int result = 0;

            switch (opChoice) {

                case "Addition":

                    result = x + y;

                    break;

                case "Subtraction":

                    result = x - y;

                    break;

                case "Multiplication":

                    result = x * y;

                    break;

                case "Division":

                    if (y == 0) {

                        Console.WriteLine("Division by 0 is not allowed.");

                        continue; }

                    result = x / y;

                    break;

                case "Modulo":

                    if (y == 0) {

                        Console.WriteLine("Modulo by 0 is not allowed.");

                        continue; }

                    result = x % y;

                    break; }

            Console.WriteLine("Result: " + result );

        } 

    }

}