There are two separate NULLs. In C for instance a pointer with the value 0 is a "null pointer". This is a language construct. When a compiler sees this construc

There are two separate NULLs. In C for instance a pointer with the value 0 is a "null pointer". This is a language construct. When a compiler sees this construct it knows to use whatever it thinks is best to represent a null pointer on the target architecture (which may not be the same thing as a representation of the value 0).