static void create_node(linkedList pList)
{
bool returnVal = true;
int list_returnval = 0;
string command;
int key = 0;
//ask user for input
Console.Write("Enter Key Value:");
command = Console.ReadLine();
returnVal = Int32.TryParse(command, out key);
//check to see if number is valid
if (returnVal == false)
{
Console.WriteLine("ERROR: Invalid input, enter number only!");
return;
}
//otherwise, create new node
list_returnval = (int)pList.create_node(key);
//see if the node was created
if (list_returnval == (int)linkedList_return.CREATE_FAILED_DUPLICATE_KEY)
{
Console.WriteLine("ERROR: Could not create node, duplicate key found");
}
else
{
Console.WriteLine("Node created successfully!");
}
}
static void delete_node(linkedList pList)
{
bool returnVal = true;
int list_returnval = 0;
string command;
int key = 0;
//ask user for input
Console.Write("Enter Key Value:");
command = Console.ReadLine();
returnVal = Int32.TryParse(command, out key);
//check to see if number is valid
if (returnVal == false)
{
Console.WriteLine("ERROR: Invalid input, enter number only!");
return;
}
//otherwise, delete node
list_returnval = (int)pList.delete_node(key);
//see if the node was deleted
if (list_returnval == (int)linkedList_return.DELETE_FAILED_KEY_NOT_FOUND)
{
Console.WriteLine("ERROR: Could not delete node, node does not exist");
}
else
{
Console.WriteLine("Node deleted");
}
}
static void Main(string[] args)
{
int shutdown = 0;
string command;
Console.WriteLine("Initialising Empty Linked List...");
//initialise the linked list
linkedList pList = new linkedList();
//get user input on what they want to do
print_help();
while (shutdown != (int)return_code.SHUTDOWN)
{
Console.Write("#Linked_List Controller > ");
//get user input
command = Console.ReadLine();
//see what the user wants to do
switch(command)
{
case "p":
case "P":
//print out the contents of the linked list
pList.print_list();
break;
case "i":
case "I":
create_node(pList);
break;
case "d":
case "D":
delete_node(pList);
break;
case "s":
case "S":
search_node(pList);
break;
case "q":
case "Q":
shutdown = (int)return_code.SHUTDOWN;
break;
case "h":
case "H":
print_help();
break;
default:
Console.WriteLine("Invalid input, type 'h' for help.");
break;
}
}
}
static void search_node(linkedList pList)
{
linkedList.default_node list_returnval = null;
bool returnVal = true;
string command;
int key = 0;
//ask user for input
Console.Write("Enter Key Value:");
command = Console.ReadLine();
returnVal = Int32.TryParse(command, out key);
//check to see if number is valid
if (returnVal == false)
{
Console.WriteLine("ERROR: Invalid input, enter number only!");
return;
}
//otherwise, search for the node
list_returnval = pList.find_node(key);
//see if the node exists
if (list_returnval == null)
{
Console.WriteLine("Node " + key + " Does not Exist");
}
else
{
Console.WriteLine("Node " + key + " found!");
}
}