Chicken and Egg Story

Source 

Quite fancied a Monday morning teaser, so here's my attempt:
using System;
namespace ChickenEgg
{
public class Program
{
public static void Main(string[] args)
{
var chicken1 = new Chicken();
var egg = chicken1.Lay();
var childChicken = egg.Hatch();
var childChicken2 = egg.Hatch();
}
}
public interface IBird
{
Egg Lay();
}
public class Egg
{
private readonly Func<IBird> _createBird;
private bool _hatched;
public Egg(Func<IBird> createBird)
{
_createBird = createBird;
}
public IBird Hatch()
{
if (_hatched) throw new InvalidOperationException("Egg already hatched.");
_hatched = true;
return _createBird();
}
}
public class Chicken : IBird
{
public Egg Lay()
{
var egg = new Egg(() => new Chicken());
return egg;
}
}
}
Please don't just copy/paste this to your prospective employer without fully understanding what's going on. That would be a waste of everyone's time.

Capturing console stream input for processing

Some good articles below found interesting in the web.

The simplest

The sample Host and Client implementation here

My Own test

 class Program
 {
  static public void test()
  {
   System.Diagnostics.Process cmd = new System.Diagnostics.Process();
   cmd.StartInfo.FileName = "cmd.exe";
   cmd.StartInfo.RedirectStandardInput = true;
   cmd.StartInfo.RedirectStandardOutput = true;
   cmd.StartInfo.CreateNoWindow = true;
   cmd.StartInfo.UseShellExecute = false;
   cmd.Start();
   cmd.StandardInput.Flush();

   cmd.StandardInput.WriteLine("echo 5 > input.txt");
   cmd.StandardInput.WriteLine("echo 3 1 2 3 >> input.txt");
   cmd.StandardInput.WriteLine("echo 2 1 1 >> input.txt");
   cmd.StandardInput.WriteLine("echo 4 10 5 5 1 >> input.txt");
   cmd.StandardInput.WriteLine("echo 0 >> input.txt");
   cmd.StandardInput.WriteLine("echo 1 2 >> input.txt");
   cmd.StandardInput.WriteLine("PrizeDraw < input.txt");
   cmd.StandardInput.Flush();
   cmd.StandardInput.Close();
   string line;
   int i = 0;
   do
   {
    line = cmd.StandardOutput.ReadLine();
    i++;
    if (line != null)
    {
     Console.WriteLine(line);
     //Console.WriteLine("Line " + i.ToString() + " -- " + line);
    }
   } while (line != null);
  }
  static void Main(string[] args)
  {
   test();
   Console.ReadLine();
  }
 }

c# coding OOPs

Code on using Char

using System;
using System.Text;

              public class TextInput {

                     protected string _value;

                     public virtual void Add(char c)

                     {

                           _value += c.ToString();

                     }

                     public virtual string GetValue()

                     {

                           return _value;

                     }

              }

              public class NumericInput : TextInput

              {

                     public override void Add(char n)

                     {

                           if(Char.IsNumber(n))

                                  _value += n.ToString();

                     }

              }

              public class UserInput

              {

                     public static void Main(string[] args)

                     {

                           TextInput input = new NumericInput();

                           input.Add('1');

                           input.Add('a');

                           input.Add('0');

                           Console.WriteLine(input.GetValue());

                           Console.ReadLine();

                     }

              }

RESULT: 10


Code 2 : IndexOf and Substring

using System;

public class Path
{
    public string CurrentPath { get; private set; }

    public Path(string path)
    {
        this.CurrentPath = path;
    }

    public void Cd(string newPath)
    {
        string[] folders = CurrentPath.Split('/');
        if(newPath.IndexOf("..")<0)
            CurrentPath += "/" + newPath;
        else
        {
            CurrentPath = CurrentPath.Substring(0, CurrentPath.LastIndexOf("/"));
       
            CurrentPath += newPath.Substring(2, newPath.Length -2);
        }
     
   
    }

    public static void Main(string[] args)
    {
        Path path = new Path("/a/b/c/d");
        path.Cd("../x");
        Console.WriteLine(path.CurrentPath);
    }
}

RESULTS : /a/b/c/x 

Unresolved - Binary Tree Search

using System;

public class Node

{

       public int Value { get; set; }

       public Node Left { get; set; }

       public Node Right { get; set; }

       public Node(int value, Node left, Node right)

       {

              Value = value;

              Left = left;

              Right = right;

       }

}

public class BinarySearchTree

{

       public static bool Contains(Node root, int value)

       {

              if (root == null) return false;

              if (root.Value == value)

                     return true;

              else if (root.Value < value)

                     return Contains(root.Right, value);

              else

                     return Contains(root.Left, value);

       }

       public static void Main(string[] args)

       {

              Node n1 = new Node(1, null, null);

              Node n3 = new Node(3, null, null);

              Node n2 = new Node(2, n1, n3);

              Console.WriteLine(Contains(n2, 3));

              Console.ReadLine();

       }

}

Palindrome Test

public class Palindrome
{
public static bool IsPalindrome(string word)
{

if (word.ToLower() == ReverseString(word.ToLower()))
return true;
return false;
}

public static void Main(string[] args)
{
Console.WriteLine(Palindrome.IsPalindrome("Deleveled"));
Console.ReadLine();
}

public static string ReverseString(string s)
{
char[] arr = s.ToCharArray();
Array.Reverse(arr);
return new string(arr);
}

}


-----------------------------

Another String Manipulation

-- imcomplete

using System;

public class Path

{

       public string CurrentPath { get; private set; }

       public Path(string path)

       {

              this.CurrentPath = path;

       }

       public void Cd(string newPath)

       {

              if (newPath == "/")  CurrentPath = "/";

              string[] cmd = newPath.Split('/');

             

              foreach (string cd in cmd)

                     switch (cd)

                     {

                           case "..":

                                  {

                                         CurrentPath = "/" + CurrentPath.Substring(1, CurrentPath.LastIndexOf('/') - 1);

                                         break;

                                  }

                           case "":

                                  {

                                         CurrentPath = ""; //to root this can only happen some cd(/x);

                                         break;

                                  }

                           default:

                                  {

                                         CurrentPath = CurrentPath + "/" + cd;

                                         break;

                                  }

                     }

       }

       public static void Main(string[] args)

       {

              Path path = new Path("/a/b/c/d");

              path.Cd("/x");

              Console.WriteLine(path.CurrentPath);

       Console.ReadLine();

       }

}

-------------
-- Smallest number left to be used ..
input = { 1, 3, 4, 5, 7 }; the answer = 2
input = { 1, 2, 3, 4, 7,9 }; the answer = 5

    class Program
    {
        static void Main(string[] args)
        {
   int[] input = { 1, 3, 4, 5, 7 };
   int result = solution(input);
   Console.WriteLine("small number to be used is {0}", result);
   Console.ReadLine();
        }

  public static int solution(int[] A)
  {
   int smallGuy = 1;
   // write your code in Java SE 8
   if (A.GetUpperBound(0) == 0) return smallGuy;
   if (A == null) return smallGuy;
   var aList = A.ToList();
 
   foreach (var number in A)
   {
    if (aList.IndexOf(smallGuy) >= 0)
     ++smallGuy;
   }
   return smallGuy;
  }
 }

LINQ

Populating data-rows into a collection list (Class)



    public class TaskStep
    {
        public int stepId {get; set;}
        public string stepName {get; set;}
        public string connectionString {get; set;}

    }

-------
                List<TaskStep> taskSteps = steps.Rows
                .Cast<DataRow>()
                .Select(row => new MyDomain.Client.Data.TaskStep
                {
                    stepId = (int)row[0],
                    stepName = (string)row[1],
                    connectionString = (string)row[2]

                })
                .ToList();

Tic Tac Toe

---------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MvcApplication3.Models
{
    public class TicTacToe
    {


        public char[] ticBoard;
        public int Player = 1; // player 1 is X; player 2
        public static int turns { get; set; }

        public TicTacToe()
        {
            ticBoard = new char[10];
            for (int iSquare = 1; iSquare <= 9; iSquare++)  //program wil ignor the 0 index
            {
                //Player = 2;
                ticBoard[iSquare] = '-'; //empty char
            }
        }

        public void makeATic()
        {
            //// for winning for testing
            //if (turns == 0)
            //{
            //    ticBoard[1] = 'O';
            //    ticBoard[2] = 'O';
            //    ticBoard[3] = 'O';
            //    ticBoard[4] = 'X';
            //    ticBoard[8] = 'X';
            //    ticBoard[9] = 'X';
            //    turns = 5;

            //}

            turns++;
            // bool validPos = false;
            Random _r = new Random();
            //int iPos = _r.Next(1, 10); // no ze index    
            List<char> listTicBoard = new List<char>();
            listTicBoard = ticBoard.ToList();
            int iSquare = listTicBoard.IndexOf('-');
            do  // (int iSquare = listTicBoard.IndexOf('-'); iSquare <= 9; iSquare++)  //program wil ignor the 0 index
            {

                if (ticBoard[iSquare] == '-')  // this square is yet to play
                {
                    //bool playThis = _r.Next(0, 1) == 0 ? false : true; // you wanna play this
                    if (((_r.Next(1, 100) % 2) == 1) || (turns == 9))  // if odd then play
                    {
                        ticBoard[iSquare] = Player == 1 ? 'X' : 'O'; //place the tick
                        Player = Player == 1 ? 2 : 1;   //switch the player
                        break;  //played
                    }
                }
                iSquare = iSquare < 9 ? iSquare + 1 : iSquare;
                iSquare = listTicBoard.IndexOf('-', iSquare);
            } while (iSquare != -1); // all being palyed      

        }

        public int doWeHaveAWinner()
        {
            if (hasAWinningCombination() == false && turns <= 9)
            {
                return 0;  //draw
            }
            else
                return Player == 1 ? 2 : 1;   //here is the winnder

        }

        public bool hasAWinningCombination()
        {
            if (turns <= 4) // cannot have a winner
                return false;

            List<string> winningCombination = new List<string>();
            winningCombination.Add("123");
            winningCombination.Add("456");
            winningCombination.Add("789");
            winningCombination.Add("147");
            winningCombination.Add("258");
            winningCombination.Add("369");
            winningCombination.Add("357");
            winningCombination.Add("159");


            for (int iCounter = 0; iCounter <= winningCombination.Count - 1; iCounter++)
            {
                bool hasAWinner = true;
                List<char> t = winningCombination[0].ToList();
                foreach (char pos in t)
                {

                    char PlayerChar = Player == 2 ? 'X' : 'O'; //player is switched at this point
                    if (ticBoard[Convert.ToInt16(pos.ToString())] != PlayerChar)
                    {
                        hasAWinner = false;  //not this combination                
                        break;
                    }
                }
                if (hasAWinner == true)
                    return true;
            }

            return false;
        }

    }

}

-----------------------------------
--Home Controller About Action Method
--------------------------------
        public ActionResult About()
        {
            TicTacToe ticboard = new TicTacToe();
            int hasAWinner = 0;
            TicTacToe.turns = 0;
            ViewBag.WinningPlayer = ", OOPS It's a draw";
            while (hasAWinner == 0 && TicTacToe.turns < 9)
            {
                ticboard.makeATic();
                if (TicTacToe.turns > 4) // cannot have a winner
                    hasAWinner = ticboard.doWeHaveAWinner();
                if (hasAWinner != 0)
                {
                    ViewBag.WinningPlayer = "Player " + hasAWinner;
                    break;
                }

            }

            var Lines = ticboard.ticBoard;

            foreach(char n in Lines)
            {
                break;
            }
       
            ViewBag.Line1 = ticboard.ticBoard[1].ToString() + ticboard.ticBoard[2].ToString() + ticboard.ticBoard[3].ToString();
            ViewBag.Line2 = ticboard.ticBoard[4].ToString() + ticboard.ticBoard[5].ToString() + ticboard.ticBoard[6].ToString();
            ViewBag.Line3 = ticboard.ticBoard[7].ToString() + ticboard.ticBoard[8].ToString() + ticboard.ticBoard[9].ToString();
 
            ViewBag.Message = "Play tic tac toe.";

            return View();
        }

-------------------------------------------

--About.chtml

------------------------------------------

@{

    ViewBag.Title = "Tic Tac Toe";

}

<hgroup class="title">

    <h1>@ViewBag.Title.</h1>

    <h2>@ViewBag.Message</h2>

</hgroup>

<article>

    <p> @ViewBag.Line1</p>

    <p> @ViewBag.Line2</p>

    <p> @ViewBag.Line3</p>

    <p><b>Winner is @ViewBag.WinningPlayer</b></p>

</article>

<aside>

    <h3>Aside Title</h3>

    <p>

        Use this area to provide additional information.

    </p>

    <ul>

        <li>@Html.ActionLink("Home", "Index", "Home")</li>

        <li>@Html.ActionLink("About", "About", "Home")</li>

        <li>@Html.ActionLink("Contact", "Contact", "Home")</li>

    </ul>

</aside>

C# Class - Quick Tutorial

This tutorial would be good for quick reference. Please Click here.

Search and replace exact string value with regex

Using regex to search for exactly matching string value in a input string. You can immediately replace the string with replacement. Click here