Question

exit method not working while pressing q return with exception handle error.its a console application should i used both application.exit() and envoirnment.exit() . both doesn’t work . am i doing something wrong . help will be really appreciated.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace calculator_extended
{
    class Program
    {
        static void Main(string[] args)
        {
            int d = 0;

            while (true)
            {
                Console.WriteLine("Press A for addition");
                Console.WriteLine("Press S for subtraction");
                Console.WriteLine("Press M for Multiplication");
                Console.WriteLine("Press D for Divide");
                Console.WriteLine("Press q for Exit");


                char c = Convert.ToChar(Console.ReadLine());

                int a = Convert.ToInt32(Console.ReadLine());
                int b = Convert.ToInt32(Console.ReadLine());

                switch (c)
                {
                    case 'A':
                    case 'a':
                        {
                            d = add(a, b);
                            Console.WriteLine(d);
                            break;


                        }


                    case 'S':
                    case 's':
                        {
                            d = sub(a, b);
                            Console.WriteLine(d);
                            break;
                        }

                    case 'M':
                    case 'm':
                        {
                            d = mul(a, b);
                            Console.WriteLine(d);
                            break;
                        }

                    case 'D':
                    case 'd':
                        {
                            d = div(a, b);
                            Console.WriteLine(d);
                            break;
                        }

                    case 'q':
                        {

                            Environment.Exit(0);
                            break;

                        }
                    default:
                        {

                            Console.WriteLine("Please Enter the correct Character");
                            break;
                        }



                }
            }
        }
            private static int add(int a, int b)
    {

                   return a + b;
    }
               private static int sub(int a, int b)
    {

                   return a - b;
    }
               private static int mul(int a, int b)
    {
                   return a * b;
    }
               private static int div(int a, int b)
    {

                   return a / b;
    }



        }
    }

ok this worked thanks guys for help can you check and let me know if the code is perfect and i am not missing something.thanks

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace calculator_extended
{
    class Program
    {
        static void Main(string[] args)
        {
            int d = 0;

            while (true)
            {
                Console.WriteLine("Press A for addition");
                Console.WriteLine("Press S for subtraction");
                Console.WriteLine("Press M for Multiplication");
                Console.WriteLine("Press D for Divide");
                Console.WriteLine("Press q for Exit");


                char c = Convert.ToChar(Console.ReadLine());
                if (c == 'q')
                {
                    Environment.Exit(0);
                }
                int a = Convert.ToInt32(Console.ReadLine());
                int b = Convert.ToInt32(Console.ReadLine());

                switch (c)
                {
                    case 'A':
                    case 'a':
                        {
                            d = add(a, b);
                            Console.WriteLine(d);
                            break;


                        }


                    case 'S':
                    case 's':
                        {
                            d = sub(a, b);
                            Console.WriteLine(d);
                            break;
                        }

                    case 'M':
                    case 'm':
                        {
                            d = mul(a, b);
                            Console.WriteLine(d);
                            break;
                        }

                    case 'D':
                    case 'd':
                        {
                            d = div(a, b);
                            Console.WriteLine(d);
                            break;
                        }


                    default:
                        {

                            Console.WriteLine("Please Enter the correct Character");
                            break;
                        }



                }
            }
        }
            private static int add(int a, int b)
    {

                   return a + b;
    }
               private static int sub(int a, int b)
    {

                   return a - b;
    }
               private static int mul(int a, int b)
    {
                   return a * b;
    }
               private static int div(int a, int b)
    {

                   return a / b;
    }



        }
    }

Answer 1

maybe it is because your application waiting for 2 numbers after you press “q”?

try to change your code, remove case “q” and replace:

char c = Convert.ToChar(Console.ReadLine());

with the following:

char c = Convert.ToChar(Console.ReadLine());
if(c.ToLower() == 'q')
{
    Environment.Exit(0);
}