//LinkedList helper method
private static void LinkedList()
{
bool inLinkedListClass = true;
while (inLinkedListClass == true) //user stays in LinkedList Class until set to false
{
Console.WriteLine("Welcome to the LinkedList class!");
Console.WriteLine();
GenericLinkedList <string> myList = new GenericLinkedList <string>();
Console.Write("Your LinkedList is empty. Enter the value of the first item to begin: "); //the first operation on the LinkedList must be Add
string entry = Console.ReadLine();
myList.Add(entry);
Console.WriteLine();
Console.WriteLine("Item added!");
Console.WriteLine("--------------------------------------------------------------------------------");
bool inLinkedList = true;
while (inLinkedList == true) //user stays in the LinkedList operations loop until set to false
{
Console.WriteLine();
Console.WriteLine("The operations below are available in the LinkedList class: ");
Console.WriteLine("1. Add (This adds an item)");
Console.WriteLine("2. Remove (This removes an item)");
Console.WriteLine("3. Check (This checks if an item is present)");
Console.WriteLine("4. Search (This searches for an item)");
Console.WriteLine("5. IsEmpty (This checks if the list is empty)");
Console.WriteLine("6. Size (This shows the number of items in the LinkedList)");
Console.WriteLine("7. Insert (This adds an item at a specified position)");
Console.WriteLine("8. Index (This returns the index of an item)");
Console.WriteLine("9. Exit LinkedList class menu");
Console.WriteLine();
Console.Write("Please select an operation: ");
string selection = Console.ReadLine();
if (selection == "1") //selection to Add item
{
Console.Write("Please enter a value to add: ");
entry = Console.ReadLine();
int size = myList.Add(entry);
Console.WriteLine();
Console.WriteLine("Item added!");
Console.WriteLine();
Console.Write("To see the current list size, enter SIZE. To ignore, enter SKIP: "); //user can optionally view current LinkedList size
string returnSize = Console.ReadLine().ToUpper();
Console.WriteLine();
if (returnSize == "SIZE")
{
Console.WriteLine($"The LinkedList currently has {size} items in it!");
}
else
{
Console.WriteLine("You decided to skip.");
}
Console.WriteLine("--------------------------------------------------------------------------------");
}
else if (selection == "2") //selection to Remove a specified item
{
Console.Write("Please enter a value to remove: ");
entry = Console.ReadLine();
bool removed = myList.Remove(entry);
Console.WriteLine();
if (removed == true) //program will indicate whether the item was removed or not found
{
Console.WriteLine("Item removed!");
}
else
{
Console.WriteLine($"Your entry, {entry} was not found in the LinkedList!");
}
Console.WriteLine("--------------------------------------------------------------------------------");
}
else if (selection == "3") //selection to check that an item exists in the List
{
Console.Write("Please enter a value to check: ");
entry = Console.ReadLine();
bool isPresent = myList.Check(entry);
Console.WriteLine();
if (isPresent == true)
{
Console.WriteLine($"{entry} is present in the LinkedList.");
}
else
{
Console.WriteLine($"{entry} does not exist in the LinkedList.");
}
Console.WriteLine("--------------------------------------------------------------------------------");
}
else if (selection == "4") //selection to search that an item exists in the List and returns the item's value
{
Console.Write("Please enter a value to search: ");
entry = Console.ReadLine();
Console.WriteLine();
myList.Search(entry);
Console.WriteLine("--------------------------------------------------------------------------------");
}
else if (selection == "5") //selection to know if the LinkedList is empty
{
bool isEmpty = myList.IsEmpty();
Console.WriteLine();
if (isEmpty == true)
{
Console.WriteLine("The LinkedList is empty.");
}
else
{
Console.WriteLine("The LinkedList is not empty.");
}
Console.WriteLine("--------------------------------------------------------------------------------");
}
else if (selection == "6") // selection to know the number of items in the LinkedList
{
int listSize = myList.Size();
Console.WriteLine();
Console.WriteLine($"There are {listSize} items currently present in the LinkedList.");
Console.WriteLine("--------------------------------------------------------------------------------");
}
else if (selection == "7") // selection to insert a specified item value as a node at the specified index
{
Console.Write("Please enter a value to insert: ");
entry = Console.ReadLine();
Console.WriteLine();
Console.Write("Please enter the desired insert position: ");
int entryPosition = int.Parse(Console.ReadLine());
Console.WriteLine();
myList.Insert(entry, entryPosition);
Console.WriteLine("Item inserted!");
Console.WriteLine("--------------------------------------------------------------------------------");
}
else if (selection == "8") // selection to know an item's index
{
Console.Write("Please enter the query item value: ");
entry = Console.ReadLine();
Console.WriteLine();
int index = myList.Index(entry);
if (index == -1)
{
Console.WriteLine($"The query item, {entry} does not exist in the LinkedList.");
}
else
{
Console.WriteLine($"The query item, {entry} is at index {index} in the LinkedList.");
}
Console.WriteLine("--------------------------------------------------------------------------------");
}
else if (selection == "9") // selection to exit the LinkedList operations loop
{
inLinkedList = false;
}
else
{
Console.WriteLine("Wrong selection. Try again.");
}
}
Console.WriteLine();
Console.Write("To continue into the LinkedList class menu, enter YES. To exit the LinkedList class, enter NO: ");
string inClass = Console.ReadLine().ToUpper();
if (inClass != "YES") // any string other than "YES" will exit the LinkedList class
{
inLinkedListClass = false;
}
}
}