NULL pointer is the same as deallocating it?

Question

I was working on a piece of code and I was attacked by a doubt: What happens to the memory allocated to a pointer if I assign NULL to that pointer?

For instance:

Answer 1

As per Phil Nash's comment, for every new, there is a corresponding delete, likewise, for every malloc, there is a corresponding free. If the corresponding delete/free is not there, you have a leak.

Hope this helps, Best regards, Tom.