static void Main(string[] args)
{
var presidents = new LinkedList <string>();
presidents.AddLast("JFK");
presidents.AddLast("Lyndon B Johnson");
presidents.AddLast("Richard Nixon");
presidents.AddLast("Jimmy Carter");
presidents.RemoveFirst();
//presidents.AddFirst("John F Kennedy"); //This is perfectly valid
LinkedListNode <string> kennedy = presidents.AddFirst("John F Kennedy"); //This is even better as we already specified the node thus no need to search for it in a future
LinkedListNode <string> nixon = presidents.Find("Richard Nixon"); // This is how you specify the node
presidents.AddAfter(nixon, "Gerald Ford"); // This presidents.AddAfter("Richard Nixon", "Gerald Ford"); wont work as you need to specify the node
/* Find method in finding the node is not ver efficient as it needs to look up the whole list */
foreach (var president in presidents)
{
Console.WriteLine(president);
}
//====================================== STACK ==========================================
/* Stack is a group of entries stack on top of each other.
* It is not indexed thus it needs to be removed one by one starting from the top of the stack.
* LAST-in First-out */
Console.WriteLine("\n\t===================== STACK ===========================");
Stack <string> books = new Stack <string>();
/* Notice that books are displayed in a reverse order.
* They are in the order they will be taken away from the stack */
books.Push("Programming WPF"); // Push adds the item on top of the stack
books.Push("The Philosophy book");
books.Push("Heat and Thermodynamics");
books.Push("Harry Potter");
Console.WriteLine(" All Books: ");
foreach (var book in books)
{
Console.WriteLine(book);
}
string peek = books.Peek(); // Peek just peeking on the items on a stack
Console.WriteLine("\r\tThe item peeked is :" + peek);
string topItem = books.Pop(); // Pop removes the item from the top of the stack
Console.WriteLine("\tTop item which was :" + topItem);
Console.WriteLine(" All Books: ");
foreach (var book in books)
{
Console.WriteLine(book);
}
//====================================== Queue ==========================================
/* Queue is essentially the same as stack just in an opposite way.
* First-in First-out from the stack */
// it is particuarly useful for tasks such as on a server.
Console.WriteLine("\n\t===================== QUEUE ===========================");
Queue <string> tasks = new Queue <string>();
tasks.Enqueue("Buy washing powder"); // Enqueue adds the item to the end of the list
tasks.Enqueue("Get the post");
tasks.Enqueue("Play a game");
tasks.Enqueue("Kiss your wife");
Console.WriteLine(" All tasks: ");
foreach (var task in tasks)
{
Console.WriteLine(task);
}
string peekTask = tasks.Peek(); // Peek just peeking on the items on a Queue
Console.WriteLine("\tThe task that was peeked is : " + peekTask);
string deleteTask = tasks.Dequeue(); // Dequeue removes the item from the beginning of the list
Console.WriteLine("\tThe item that was dequeued was : " + deleteTask);
Console.WriteLine(" All tasks: ");
foreach (var task in tasks)
{
Console.WriteLine(task);
}
}
public static void Main(string[] args)
{
string menuSelection = "", newNode = "", existingNode = "";
LinkedList ll = new LinkedList(new Node("zzz"));
do
{
newNode = "";
PrintMainMenu();
menuSelection = Console.ReadLine();
Console.Clear();
switch (menuSelection)
{
case "1":
Console.WriteLine("What value you like the new Node to contain?");
newNode = Console.ReadLine();
if (newNode != "")
{
ll.AddNode(new Node(newNode));
}
else
{
Console.Clear();
Console.WriteLine("Sorry, you must input a value for the Node. Please try again.");
}
Console.Write("\nPress any key to return to main menu...");
Console.ReadKey();
Console.Clear();
break;
case "2":
Console.WriteLine("What value you like the new Node to contain?");
newNode = Console.ReadLine();
Console.Clear();
Console.WriteLine("What is the value of the existing Node to insert the new Node before?");
existingNode = Console.ReadLine();
if (newNode != "" && existingNode != "")
{
ll.AddBefore(new Node(newNode), new Node(existingNode));
}
else
{
Console.Clear();
Console.WriteLine("Sorry, you must input a value for both Nodes. Please try again.");
}
Console.Write("\nPress any key to return to main menu...");
Console.ReadKey();
Console.Clear();
break;
case "3":
Console.WriteLine("What value you like the new Node to contain?");
newNode = Console.ReadLine();
Console.Clear();
Console.WriteLine("What is the value of the existing Node to insert the new Node after?");
existingNode = Console.ReadLine();
if (newNode != "" && existingNode != "")
{
ll.AddAfter(new Node(newNode), new Node(existingNode));
}
else
{
Console.Clear();
Console.WriteLine("Sorry, you must input a value for both Nodes. Please try again.");
}
Console.Write("\nPress any key to return to main menu...");
Console.ReadKey();
Console.Clear();
break;
case "4":
Console.WriteLine("What value you like the new Node to contain?");
newNode = Console.ReadLine();
if (newNode != "")
{
ll.AddLast(new Node(newNode));
}
else
{
Console.Clear();
Console.WriteLine("Sorry, you must input a value for the Node. Please try again.");
}
Console.Write("\nPress any key to return to main menu...");
Console.ReadKey();
Console.Clear();
break;
case "5":
Console.WriteLine("What is the value of the Node you would like to find?");
existingNode = Console.ReadLine();
if (existingNode != "")
{
Node checkNode = ll.Find(existingNode);
if (checkNode != null)
{
Console.WriteLine("\nFound!");
}
else
{
Console.WriteLine("\nThat Node doesn't exist.");
}
}
else
{
Console.Clear();
Console.WriteLine("Sorry, you must input a value for the Node. Please try again.");
}
Console.Write("\nPress any key to return to main menu...");
Console.ReadKey();
Console.Clear();
break;
case "6":
ll.PrintNodes();
Console.Write("\nPress any key to return to main menu...");
Console.ReadKey();
Console.Clear();
break;
case "7":
Environment.Exit(0);
break;
default:
Console.WriteLine("That did not match one of the menu options. Try again.\n");
break;
}
} while (menuSelection != "7");
}
