Check the C standard. It has a NULL. How it's implemented is implementation defined, which means it could be anything. Section 7.1.6 of the 1990 standard (yes, there's a 1999 standard - I don't have a copy of that) includes the text:
The macros are
which expands to an implementation-defined null pointer constant
You're confusing C with C++ which defines NULL to be equivalent to the integer constant 0. Normally in C, the define is actually (void*)0.
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