I see what you are saying. I mean zero as null constant. I've never even seen anyone try to assign a null value with some integer zero at some memory address.

I see what you are saying. I mean zero as null constant. I've never even seen anyone try to assign a null value with some integer zero at some memory address. Using the NULL constant in C/C++ is near effortless and 0 just works no matter what the underlying implementation is doing. So for all intents and purposes nullptr is just a casted NULL (0) constant.