08_ChooseTypeOfVariable

using System;
using System.Text;
using System.Threading;
using System.Globalization;

class ChooseTypeOfVariable
{
    static void Main()
    {
        int usersChoice;
        int number;
        double realNumber;

        // Change the decimal separator to "."
        Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;

        Console.WriteLine("Please enter what type of variable you will be entering:");
        Console.WriteLine("0 for an integer number");
        Console.WriteLine("1 for a double number");
        Console.WriteLine("2 for a string");

        string str = Console.ReadLine();

        if (!int.TryParse(str, out usersChoice))
        {
            Console.WriteLine("Invalid number: {0}", str);
        }
        else
        {
            switch (usersChoice)
            {
                case 0:
                    Console.Write("Enter the variable: ");

                    str = Console.ReadLine();

                    if (!int.TryParse(str, out number))
                    {
                        Console.WriteLine("Invalid number: {0}", str);
                    }
                    else
                    {
                        number++;
                        Console.WriteLine("The new number is: {0}", number);
                    }

                    break;

                case 1:
                    Console.Write("Enter the variable: ");

                    str = Console.ReadLine();

                    if (!double.TryParse(str, out realNumber))
                    {
                        Console.WriteLine("Invalid number: {0}", str);
                    }
                    else
                    {
                        realNumber++;
                        Console.WriteLine("The new number is: {0}", realNumber);
                    }

                    break;

                case 2:
                    Console.Write("Enter the variable: ");
                    string text = Console.ReadLine();

                    text += '*';
                    Console.WriteLine("The new string is: {0}", text);

                    break;

                default: Console.WriteLine("Please enter correct number from the list!");
                    break;
            }
        }
    }
}