0

Heres my problem. I can add a node to my linked list in the front and middle, and at the end. But if I add a node to the end of the list and try to print it out, the program crashes. I studied the code and didn't find any reason why it would do this. I also asked my programming teacher why and he couldn't figure it out.

Secondly, if i try to add to the end more than twice, i loose the linked list completly and the program crashes even without trying to print it. Any help would be appreciated.:)

Heres my header file:

```
#include <iostream>
using namespace std;
struct node
{
int data;
node * next;
};
class linked_list
{
private:
node *hd;
public:
linked_list()
{
hd = NULL;
}
void add_to_end(int data)
{
node *temp;
if (hd == NULL)
{
node *new_node;
new_node = new node;
new_node->data = data;
//if I omit the next line then the print function works fine
hd = new_node;
}
else
{
for (temp = hd; temp->next != NULL; temp = temp->next){}
node *new_node;
new_node = new node;
new_node->data = data;
//if I omit the next line then the print function works fine
temp->next = new_node;
}
}
void add_to_begin(int data)
{
node *new_head;
new_head = new node;
new_head->data = data;
new_head->next = hd;
hd = new_head;
}
void add_to_pos(int pos, int data)
{
int i;
node *temp;
node *new_node;
new_node = new node;
new_node->data = data;
if (pos == 0)
add_to_begin(data);
else
{
for (temp = hd, i = 1; temp->next != NULL && i < pos; temp = temp->next, i++){}
if (temp->next != NULL)
new_node->next = temp->next;
temp->next = new_node;
}
}
void print_list()
{
node *temp;
for (temp = hd; temp != NULL; temp = temp->next)
{
cout << temp->data << " ";
}
}
};
```

And heres my main file:

```
#include <iostream>
#include "linked_list.h"
using namespace std;
int main()
{
linked_list test;
test.add_to_end(1);
test.add_to_begin(2);
test.add_to_begin(3);
test.add_to_end(5);
test.add_to_pos(1,4);
test.print_list();
return 0;
}
```

Any help would be appreciated.:)