#include "house.h" int main(){ house new_house (“Henan”, 3, 2019); house* ptr_to_house = nullptr; ptr_to_house = &new_house; return 0; }

The code you provided creates a new instance of the `house` class with the location "Henan", 3 rooms, and built in 2019. It then creates a pointer `ptr_to_house` and initializes it to `nullptr`. Finally, it assigns the address of `new_house` to `ptr_to_house`.

However, this code does not do anything with the `ptr_to_house` pointer. If you want to use the pointer to call the `print_house_details()` function, you would need to add that code. Here's an example of how to call the function using the pointer:

#include "house.h"

int main() {
    // Create a new house object
    house new_house("Henan", 3, 2019);

    // Create a pointer to the house object
    house* ptr_to_house = nullptr;
    ptr_to_house = &new_house;

    // Call the print_house_details function using the pointer
    ptr_to_house->print_house_details();

    return 0;
}

In this example, we call the `print_house_details()` function using the `ptr_to_house` pointer and the arrow operator `->`. This will output:

Location: Henan
Number of rooms: 3
Year built: 2019