using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace Calculator

{

    public class Program

    {

        static void Main(string[] args)

        {

            double result;

​

​

//            while (true)

//            {

                Operation operation = new Operation();

​

                Console.Write("Enter first number: ");

                operation.OperandX = Convert.ToDouble(Console.ReadLine());

​

                Console.Write("Enter the operation: ");

                operation.OperationName = Convert.ToChar(Console.ReadLine());

​

                Console.Write("Enter second number: ");

                operation.OperandY = Convert.ToDouble(Console.ReadLine());

​

                result = operation.ProcessOperation();

                Console.WriteLine($"The result is: {result}");

//            }

​

        }

​

        public class Operation

        {

            public double OperandX;

            public char OperationName;

            public double OperandY;

​

​

            public double ProcessOperation()

            {

                double result;

                if (OperationName == '+')

                {

                    result = OperandX + OperandY;

                }

                else if (OperationName == '-')

                {

                    result = OperandX - OperandY;

                }

                else if (OperationName == '*')

                {

                    result = OperandX * OperandY;

                }

                else if (OperationName == '/')

                {

                    if (OperandY != 0)

                    {

                        result = OperandX / OperandY;

                    }

                    else

                    {

                        result = Double.PositiveInfinity;

                        Console.WriteLine("Error! Division by zero is impossible");

                    }

                }

                else

                {

                    result = Double.NaN;

                    Console.WriteLine("Enter valid operation!");

                }

​

                return result;

            }

        }

    }

}