Linked List

[emjei]

i'm having a trouble about my program. it is having an unhandled exception.

here it is.

//MyLinkedList.h
#ifndef MyLinkedList_h
#define MyLinkedList_h

class LinkedList
{
	struct nodeType
	{
		int info;
		nodeType* link;
	};

	nodeType* head;
	nodeType* current;

public:
	void AddNode();
	void DisplayNodeData();
};

#endif 

//MyLinkedList.cpp
#include <iostream>
#include "MyLinkedList.h"

using namespace std;

void LinkedList::AddNode()
{
	nodeType* newNode;

	newNode = new nodeType;

	cout << "Enter data: ";
	cin >> newNode -> info;
	newNode -> link = NULL;

	if(head == NULL)
	{
		head = newNode;
	}
	else
	{
		current = head;
		while(current -> link != NULL)
		{
			current = current -> link;
		}
		current -> link = newNode;
	}
}

void LinkedList::DisplayNodeData()
{
	nodeType *temp;
	temp = head;
	cout << "\n\n=========================\n";

	if(temp == NULL)
		cout << "List is empty!" << endl;
	else
		while(temp != NULL)
		{
			cout << "Info: " << temp -> info;
			cout << "\n";
			temp = temp -> link;
		}
}

//ProgExer01.cpp
#include <iostream>
#include "MyLinkedList.h"

using namespace std;

int main()
{
	int numberOfNodes;
	LinkedList linked;
	cout << "How many nodes do you want to add? (integers only): ";
	cin>> numberOfNodes;
	while(numberOfNodes > 0)
	{
		linked.AddNode();
		--numberOfNodes;
	}

	linked.DisplayNodeData();

	system("pause");
	return 0;
}

im hoping for your answers.

[o1vk4iN6]

What line?

You can always use the STL 'list';

#include <list>

std::list<int> values;

[emjei]

in line 24 of MyLinkedList.cpp

[o1vk4iN6]

Do you have a constructor that sets "head" to NULL? If you don't initialize it to NULL than how's it being set to NULL? So you are trying to use a bad pointer, which could be anything really.

[emjei]

ohh. thanks.