link list

segmentation fault is given whY?

Code:

struct node {int key;node * next};
node * head,*tmp;
               head=tmp;
                
                for(int i=0;i<nPoints;i++)
                {
                 tmp=new node;
                 tmp->key=i;
                 tmp=tmp->next;
                 tmp=NULL;
                                                                                                                            
                 }
cout<<head->next->key;

I find it hard to understand what your trying to accomplish by the way you code. If you could give me more detailed information I could probably help better, but fromt he code you have given me.

tmp=tmp->next;
You have just set temp to equal a new node thefore next is going to equal 0. Don't you want to assign this temporary value to the next one on the head node.??

I dont know if this helps you but I created a linked list program that does the same as I think you want to acheive.

Code:

#include <iostream.h>

class Node
{
public:
	Node(): itsNext(0), itsKey(0) {}
	~Node() {}

	void Insert (Node * theNode);
	int getKey()const { return itsKey; }
	void setKey(int key) { itsKey = key; }

	void Show();
private:
	Node *itsNext;
	int itsKey;
};

void Node::Insert(Node *theNode)
{
	if (itsNext == 0)
		itsNext = theNode;
	else
		itsNext->Insert(theNode);
}

void Node::Show()
{
	cout << itsKey;
	if (itsNext == 0)
		return;
	itsNext->Show();
}



class LinkedList
{
public:
	LinkedList(): itsHead(0) {}

	void Insert(Node *theNode);
	void Show();
private:
	Node * itsHead;
};

void LinkedList::Insert(Node *theNode)
{
	if (itsHead == 0)
		itsHead = theNode;
	else
		itsHead->Insert(theNode);
}

void LinkedList::Show()
{
	if (itsHead == 0)
		return;
	itsHead->Show();
}

int main()
{
	LinkedList theList;
	Node *theTemp;

	for (int i = 0; i < 10; i++)
	{
		theTemp = new Node;
		theTemp->setKey(i);
		theList.Insert(theTemp);
	}

	theList.Show();
	return 0;
}