Question

Is there any difference between these two functions? I mean in-terms of the result returned?

int Length(struct node* head) {
  struct node* current = head;
  int count = 0;

  while (current != NULL) {
    count++;
    current = current->next;
  }

  return count;
}

and this function

int Length(struct node* head) {
  int count = 0;

  while (head != NULL) {
    count++;
    head = head->next;
  }

  return count;
}

Answer 1

They are the same. One uses a local ‘current’ variable to iterate over the list, while the other one uses the same variable that was received through the function arguments.