using System;
 
public class Program
{
  public static void Main(string[] args)
  {
    // Variable declarations.
 
    string[] todo = new string[100]; // This will hold the items in the todo list.
    // Note that we are arbitrarily deciding that the maximum number of items is 100.
    bool[] status = new bool[100]; // This will hold the status of each item.
    // true means "done", false means "not done".
    string uInput; // This will hold user input.
    int todoSize = 0; // This will hold the actual number of items in the list.
    int completed = 0; // This will hold the number of items done.
    int justdone; // This will hold the number of the last item completed.
    bool valid; // This will hold true if the user input is valid (a positive number
    // less than the number of items in the list), false otherwise. Used for user-input
    // validation.
    char itemStatus; // This will hold '☑' if the current item is done,
    // '☐' otherwise.
 
    // We start by populating the list with items.
    do
    {
      Console.WriteLine(
        "What is on your todo list? Enter \"done\" when you are done."
      );
      uInput = Console.ReadLine();
      if (uInput != "done")
      {
        todo[todoSize] = uInput; // We can store the first item at index todoSize
        // since its initial value is 0.
        todoSize++; // We increment the number of items in the list.
      }
    } while (uInput != "done"); // When the user enters "done", we exit this loop.
 
    // We now display the todo list, and ask the user to indicate which item they
    // completed, as long as there are some items left in their list.
 
    while (completed != todoSize)
    {
      // We display the todo list.
      Console.WriteLine("Here is your current todo list:");
      Console.WriteLine("| # | Status | Task |");
      for (int i = 0; i < todoSize; i++)
      {
        if (status[i])
        {
          itemStatus = '☑';
        }
        else
        {
          itemStatus = '☐';
        }
        Console.WriteLine(
          "| "
            + (i + 1)
            + " |   "
            + itemStatus
            + "    | "
            + todo[i]
        );
      }
      // We now ask the user to enter the number of the completed item.
      valid = false; // We assume that the user has not given a valid value yet.
      do
      {
        Console.WriteLine(
          "Enter the number of the task you completed."
        );
        valid =
          int.TryParse(Console.ReadLine(), out justdone)
          && 0 < justdone
          && justdone <= todoSize;
      } while (!valid);
      status[justdone - 1] = true; // We indicate that the item was completed by setting its value to true.
      completed++; // We increment the number of items completed.
      Console.WriteLine(
        $"You are {completed / (double)todoSize:P} done!"
      );
      // Note that we force double division using casting, and use the :P format speficier.
    }
    Console.WriteLine("Congratulations!");
  }
}

class Todo{
    public string Description{get; set;}
    public bool Status{get; set;}
}

Todo[] todoList = new Todo[100];
todoList[0] = new Todo();
todoList[0].Description = "My first item";
todoList[0].Status = false;
Console.Write(todoList[0].Description + (todoList[0].Status ? " done" : " not done"));