Friday, May 25, 2007

How to create a copy of a linked list? Write a C program to create a copy of a linked list.

Check out this C program which creates an exact copy of a linked list.


copy_linked_lists(struct node *q, struct node **s)
{
if(q!=NULL)
{
*s=malloc(sizeof(struct node));
(*s)->data=q->data;
(*s)->link=NULL;
copy_linked_list(q->link, &((*s)->link));
}
}

35 comments:

paras said...

what about creation of header node.

Avnika said...

Hi Paras,
The header node will be returned in the out parameter "s". The header node is being set when we are allocating memory for the first node.

Regards,
Avnika

Anonymous said...

How will the new link list nodes connect to each other? The function should return *s..?

Anonymous said...

you are passing the address containing address of destination list....no need to return anything..

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Rona said...

this is a recursive soln:to copying


// Recursive variant
struct node* CopyList(struct node* head) {
if (head == NULL) return NULL;
else {
struct node* newList = malloc(sizeof(struct node)); // make the one node
newList->data = current->data;
newList->next = CopyList(current->next); // recur for the rest
return(newList);
}
}

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