Calculator in C#

 A simple calculator program is written in  C# programming language.

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Program Listing

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            try

            {

                Run();

            }

            catch (Exception ex)

            {

                Console.WriteLine("The following error occured\n" + ex);

            }

            Console.ReadKey();

        }

        private static void Run()

        {

            Console.WriteLine("\n");

            Console.Write("\tCalculator in C#");

            Console.WriteLine("\n");

            int firstNum = ReadInt("\tEnter first number: ");

            int secondNum = ReadInt("\tEnter second number: ");

            Console.Write("\tEnter operator: ");

            int op = Console.Read();

            int result = CoCalculation(firstNum, secondNum, (char)op);

            Console.WriteLine("\n");

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

            Console.WriteLine("\n");

            Console.Write("\tEnd of Program");

            Console.WriteLine("\n");

        }

        private static int CoCalculation(int firstNum, int secondNum, char op)

        {

            switch (op)

            {

                case '+':

                    return firstNum + secondNum;

                case '-':

                    return firstNum - secondNum;

                case '*':

                    return firstNum * secondNum;

                case '/':

                    if (secondNum == 0)

                        throw new Exception("Cannot divide by 0");

                    return firstNum / secondNum;

                default:

                    throw new Exception("Illegal operand");

            }

        }

        private static int ReadInt(string prompt)

        {

            Console.Write(prompt);

            string input = Console.ReadLine();

            return int.Parse(input);

        }

    }

}