void testpairwiseswap()
{
struct node* node = buildlistattailbyref(10);
printlist(node, "node");
pairwiseswap(node);
pairwiseswaprecur(node);
printlist(node, "after pairwise swap");
}
int main()
{
struct node* head = NULL;
push(&head,1);
push(&head,2);
push(&head,3);
push(&head,4);
push(&head,5);
printf("Linked list before swapping:\n");
print(head);
pairwiseswap(head);
printf("\nLinked list after swapping:\n");
print(head);
}
