using System;

​

namespace calculator

{

    class Program

    {

        static void Main(string[] args)

        {

            while (true)

            {

                int firstNumber = ReadInteger("Enter your first number: ");

​

                string operation = ReadString("Enter the operation (+, -, *, /): ");

​

                int secondNumber = ReadInteger("Enter your second number: ");

​

                if (operation == "+") PrintAnswer(Add(firstNumber, secondNumber));

                else if (operation == "-") PrintAnswer(Subtract(firstNumber, secondNumber));

                else if (operation == "*") PrintAnswer(Multiply(firstNumber, secondNumber));

                else if (operation == "/") PrintAnswer(Divide(firstNumber, secondNumber));

                else Console.WriteLine("Invalid input.");

            }

        }

​

        static int ReadInteger(string prompt)

        {

            Console.WriteLine(prompt);

            string numberStr = Console.ReadLine();

            int number = int.Parse(numberStr);

            return number;

        }

        static string ReadString(string prompt)

        {

            Console.WriteLine(prompt);

            string input = Console.ReadLine();

            return input;

        }

​

        static int Add(int a, int b)

        {

            return a + b;

        }

        static int Subtract(int a, int b)

        {

            return a - b;

        }

        static int Multiply(int a, int b)

        {

            return a * b;

        }

        static int Divide(int a, int b)

        {

            return a / b;

        }

​

        static void PrintAnswer(int answer)

        {

            Console.WriteLine($"Your answer is {answer}.");

            Console.Write("Press enter to continue: ");

            Console.ReadLine();

            Console.Clear();

        }

    }

}