Define null pointer.

In Perl Prepare a program  using package that insert the name of a student (“Jonothan”). The main program will show the name. Hint: can use: constructor that returns objects, and  hash reference that holds the attribute name.

How to write a set builder notation for a set S that should have at least one element?

Every time you write a non-const member function for a linked list, you should always think about if that function is preserving your class invariants. Group of answer choices A. True B. False

Write code snippets that demonstrates i.) generic interface and  generic constructor

In C++, can I get a code example for a function that will return the intersection items for two sets. It will return/print out the shared (intersection) items for them. I am looking for an actual function preferably for a set class, comparing one instance of a set class with another, but definitely NOT a STL keyword. Thank you.

Type Casting & Inspection - How do you do this with Swift code?

Explain A Collection Class Implementation Using ArrayLists?in c#

- the constructor needs to initialize tailPtr to nullptr   - insert(): modify it to update prev pointers as well as next pointers.   - remove(): modify to update prev pointers as well as next pointers.   Add a new public member function to the LinkedList class named reverse() which reverses the items in the list. swap each node’s prev/next pointers, and finally swap headPtr/tailPtr.  Demonstrate your function works by creating a sample list of a few entries in main(), printing out the contents of the list, reversing the list, and then printing out the contents of the list again to show that the list has been reversed.   Note: your function must actually reverse the items in the doubly-linked list, not just print them out in reverse order! we won't use the copy constructor in this assignment, and as such you aren't required to update the copy constructor to work with a doubly-linked list. @file LinkedList.cpp */ #include "LinkedList.h"  // Header file#include <cassert>#include…