#includeIn this example, we create a LLPointer to an integer and then check if the pointer is null using the isNull() function. If the pointer is null, we print a message saying so. Otherwise, we print a message saying the pointer is not null. The package library for LLPointer is difficult to determine as it is likely a custom implementation for a specific linked list data structure. However, there are several open source linked list libraries available for C++ that may incorporate a similar pointer class.#include "LLPointer.h" int main() { LLPointer ptr; // create an integer pointer if (ptr.isNull()) { std::cout << "Pointer is null." << std::endl; } else { std::cout << "Pointer is not null." << std::endl; } return 0; }