using System;

using System.Threading;

using System.Threading.Tasks;

using System.ComponentModel;

using System.Diagnostics;

​

public class Program

{

    public static async void Main()

    {

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

        string input = Console.ReadLine();

        double inputNumber;

        if(!(Double.TryParse(input, out inputNumber)))

        {

            Console.WriteLine("\"{0}\" is not a number!", input);

            return;

        }

        Stopwatch stopwatch = new Stopwatch();

        stopwatch.Start();

        double outputNumber;

        Task<double> task = new Task<double>(() => {

            return WaitAndReturnSquaredDouble(inputNumber);

        });

        Console.WriteLine("Task status: {0}", task.Status);

        WriteObjectPropertiesToConsole(task, stopwatch);

        if (inputNumber > 1)

        {

            task.Start(); 

            Console.WriteLine("Calculating...");

            Console.WriteLine("Task status: {0}", task.Status);

        }

        if (task.Status == TaskStatus.Created)

        {

            Console.WriteLine("No calculation needed!");

            outputNumber = inputNumber;

        }

        else

        {

            Console.WriteLine("Task status: {0}", task.Status);

            WriteObjectPropertiesToConsole(task, stopwatch);

            task.Wait();

            outputNumber = task.Result;

        }

        WriteObjectPropertiesToConsole(task, stopwatch);

​

        Console.WriteLine(" {0} squared is {1}", inputNumber, outputNumber);

    }

    private static double WaitAndReturnSquaredDouble(double number)

    {

        Thread.Sleep(5000);

        return Math.Pow(2, number);

    }

    private static void WriteObjectPropertiesToConsole(object obj, Stopwatch stopwatch = null)

    {

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

        //Console.WriteLine("Timestamp: {0}", DateTime.Now);

        foreach(PropertyDescriptor descriptor in TypeDescriptor.GetProperties(obj))

        {

            string name = descriptor.Name;

            if (name == "Result") continue;

            object value = descriptor.GetValue(obj);

            Console.WriteLine("{0}={1}", name, value);

        }

        if (stopwatch != null)

            Console.WriteLine("*Elapsed time: {0}", stopwatch.ElapsedMilliseconds);

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

        //Console.Out.Flush();

    }

}