Empty Linked List

[proctorwho]

Hi, I've got an assignment where we have to start out with an empty linked list that is formatted as IntNode* head = NULL;

Every time I attempt to run it, it goes to that line and then the program stops working.

Any ideas? I'll include the rest of the code below.

#include "IntNode.h"
#include <iostream>

using namespace std;

bool run = true;

void start()
{
    cout << "1. Add an integer to the front of the list" << endl;
	cout << "2. Add an integer to the back of the list" << endl;
	cout << "3. Remove a numer from the list" << endl; 
	cout << "4. Print the list" << endl;
	cout << "5. Print the number of items from the list" << endl;
	cout << "6. Quit" << endl;
	cout << "Enter your choice." << endl;
	
}

	

void insertFront(IntNode* &head) 
{
	int num;
    cout << "Enter the number:";
	cin >> num;

	IntNode* newFront = new IntNode;
	newFront -> data = num;
	newFront -> next = head;
	head = newFront;

	cout << "Added the number" << endl;
}

void print(IntNode* head) 
{

	IntNode* curr = head;

	cout << "The List is :";

	while(curr != NULL)
	{
		cout << curr -> data << " ";
		curr = curr -> next;
	}

	cout << endl;
}


void insertAfter(IntNode* head) 
{
	int num;
    cout << "Enter the number:";
	cin >> num;
	
	IntNode* back = new IntNode;
	back->data = num;
	back->next = NULL;

	IntNode* curr = head;
	while (curr->next != NULL) 
	{
		curr = curr->next;
	}

	curr->next = back;

	cout << "Added the number." << endl;
}

void remove(IntNode* &head)
{
	int num;
    cout << "Enter the number:";
	cin >> num;

	IntNode* curr = head;
	IntNode* prev = NULL;

	while ((curr != NULL) && (curr->data != num)) {
		prev = curr;
		curr = curr -> next;
	}
	

	if ((prev == NULL) && (curr != NULL)) {
		head = head -> next;
		delete curr;
		curr = NULL;
	}
	else if (curr != NULL) {
		prev -> next = curr -> next;
		delete curr;
		curr = NULL;
	}

	cout << "Removed." << endl;
	cout << endl;
}
void printNumberOfElement(IntNode* head)
{
	
	IntNode* curr = head;

	int count = 0;

    while (curr != NULL) 
	{
      count++;
	  curr = curr -> next;
	}
	
	cout << "The Number of List :";
	cout << count <<endl;
}



void quit()
{
	run = false;
}

int main()
{

    IntNode* head = NULL;
    head -> data = NULL;

    head -> next = NULL;

    cout<<"Welcome to the linked list program."<<endl;
	cout<<"What would you like to do?"<<endl;
	
	start();

	while(run == true)
	{
		int n;
		int choice;
		
		cout << endl;
		cout<<"Enter your choice: ";
		cin >> n;
	
		choice = n;

		if (choice == 1)
		{
			insertFront(head);
		}

		if (choice == 2)
		{
			insertAfter(head);
		}


		if (choice == 3)
		{
			remove(head);
		}

		if (choice == 4)
		{

			print(head);
		}

		if (choice == 5)
		{
			printNumberOfElement(head);
		}

		if (choice == 6)
		{
			quit();
		}
	}
}

The Header file contains two public fields, data that takes and int and next, which takes an IntNode pointer

[proctorwho]

Can anyone help me out?

[proctorwho]

Nevermind, I figured it out.