using System;

public class Calculator

{

    public static double DoOperation()

    {

        double result = double.Nan;

        switch (op)

        {

            case "a":

                result = num1 + num2;

                break;

            case "s":

                result = num1 - num2;

                break;

            case "m":

                result = num1 * num2;

                break;

            case "d":

                if (num2 != 0)

                {

                    result = num1 * num2;

                break;

        }

        return result;

    }

}

​

​

public class Program

{

    public static void Main()

    {

        bool endApp = false;

        Console.WriteLine("Console Calcukatir in C#\r");

        Console.WriteLine("........................\n");

        while (!endApp)

        {

            string numInput1 = "";

            string numInput2 = "";

            double result = 0;

            Console.WriteLine("Type a number and oress Enter: ");

            numInput1 = Console.ReadLine();

            double cleanNum1 = 0;

            while(!double.TryParse(numInput1, out cleanNum1))

            {

                Console.Write("This is not a valid input.");

                numInput1 = Console.ReadLine();

            }

            Console.Write("Type another number and press Enter:");

            numInput2 = Console.ReadLine();

            double cleanNum2 = 0;

            while(!double.TryParse(numInput2, out cleanNum2))

            {

                Console.Write("This is not a valid input.");

                numInput2 = Console.ReadLine();

            }

            Console.WriteLine("Choose an operator from the following list:");

            Console.WriteLine("\ta - Addition");

            Console.WriteLine("\ts - Substraction");

            Console.WriteLine("\tm - Multiplication");

            Console.WriteLine("\td - Division");

            Console.WriteLine("Your choice?");

            string op = Console.ReadLine();

            try

            {

                result = Calculator.DoOperation(cleanNum1, cleanNum2 op);

                if (double.IsNaN(result))

                {

                    Console.WriteLine("Mathematical Error\n");

                }

                else Console.WriteLine("Our resukt is: {0:0.##}\n", result);

            }

            catch (Exception e)

            {

            }

        }

    }

}

using System;

​

​

​

public class Calculator

​

{

​

    public static double DoOperation(double num1, double num2, string op)

​

    {

​

        double result = double.NaN;

​

        switch (op)

​

        {

​

            case "a":

​

                result = num1 + num2;

​

                break;

​

            case "s":

​

                result = num1 - num2;

​

                break;

​

            case "m":

​

                result = num1 * num2;

​

                break;

​

            case "d":

​

                if (num2 != 0)

​

                {

​

                    result = num1/num2;

​

                }

​

                break;

​

            default:

​

                break;

​

        }

​

        return result;

​

    }

​

​

}

​

​

public class Program

​

{

​

    public static void Main()

​

    {

​

        bool endApp = false;

​

        Console.WriteLine("Console Calculator in C#\r");

​

        Console.WriteLine("------------------------\n");

​

        while (!endApp)

​

        {

​

            string numInput1 = "";

​

            string numInput2 = "";

​

            double result = 0;

​

​

            Console.WriteLine("Type a number and press Enter: ");

​

            numInput1 = Console.ReadLine();

​

​

            double cleanNum1 = 0;

​

            while(!double.TryParse(numInput1, out cleanNum1))

​

            {

​

                Console.Write("This is not valid input.");

​

                numInput1 = Console.ReadLine();

​

            }

​

​

            Console.Write("type anothe number and press Enter: ");

​

            numInput2 = Console.ReadLine();

​

​

            double cleanNum2 = 0;

​

            while(!double.TryParse(numInput2, out cleanNum2))

​

            {

​

                Console.Write("This is not valid input.");

​

                numInput2 = Console.ReadLine();

​

            }

​

​

            Console.WriteLine("choose an operator from the following list:");

​

            Console.WriteLine("\ta - Adunare");

​

            Console.WriteLine("\ts - Scadere");

​

            Console.WriteLine("\tm - Inmultire");

​

            Console.WriteLine("\td - impartire");

​

            Console.WriteLine("Your option?");

​

​

            string op = Console.ReadLine();

​

​

            try

​

            {

​

                result = Calculator.DoOperation(cleanNum1, cleanNum2, op);

​

                if (double.IsNaN(result))

​

                {

​

                    Console.WriteLine("eroare matematica\n");

​

                }

​

                else Console.WriteLine("Resultatul nostru este: {0:0.##}\n", result);

​

            }

​

​

            catch (Exception e)

​

            {

​

                Console.WriteLine("eroare \n - detalii" + e.Message);

​

            }

​

            Console.WriteLine("---------------------");

​

            Console.Write("press");

​

            if (Console.ReadLine() == "n") endApp = true;

​

            Console.WriteLine("\n");

​

​

        }

​

        return;

​

    }

​

}