using System;

public class Program

{

    public static void Main()

    {

​

            double num1;

            double num2;

            char Operator = ' ';

            char con = 'y';

            Console.WriteLine(" 'Operation to be use' ");

            Console.WriteLine("    +  -  *  /   ");

​

            while (con == 'y' || con == 'Y')

            {

               Console.Write("\nEnter First number: ");

               num1 = double.Parse(Console.ReadLine());

               Console.Write("Enter an Operator: ");

               Operator = char.Parse(Console.ReadLine());

               if (Operator != '+' && Operator != '-' && Operator != '*'

                    && Operator != '/')

                {

                    Console.WriteLine("You entered an invalid operator! ");                  

                    continue;

​

                }

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

                   num2 = double.Parse(Console.ReadLine());

                  Compute(num1, num2, Operator);

                   Console.Write("\nWant more Computation ? (y/n)  ");

                  con = char.Parse(Console.ReadLine());

        }

            Console.ReadLine();

        }

        static void Compute(double num1, double num2 , char oper)

        {

​

            double result; 

            switch (oper)

            {

                case '+':

                    result = num1 + num2;

                    Console.WriteLine(" {num1} {oper} {num2} =  {result} ");

                    // pwede mo itong gawin na string.Format();

                    // for example

                    Console.WriteLine(string.Format("{0} {1} {2} is equal to {3}", num1, oper, num2, result));

                    break;

                case '-':

                    result = num1 - num2;

                    Console.WriteLine("{num1} {oper} {num2} =  {result} ");

                    break;

                case '*':

                    result = num1 * num2;

                    Console.WriteLine(" {num1} {oper} {num2} =  {result} ");

                    break;

                case '/':

                    try

                    {

                        result = num1 / num2;

                        Console.WriteLine(" {num1} {oper} {num2} =  {result} ");

                    }

                    catch (DivideByZeroException j)

                    {

                        Console.WriteLine(j.Message.ToString());

                    }

                    break;

​

                default:

                    Console.WriteLine("!!!!");

                    break;

​

            }

        }

​

    }