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cornstalks | on: The C23 edition of Modern C
> what is wrong with NULL?

For starters, you have to #include a header to use it.

zik | parent | next
And it avoids the NULL == 0 ambiguity, allowing for better type checking.
johnisgood | parent
Well, I always include stdio.h which includes stddef.h that defines NULL as (void *)0.
dhhfss | root | parent
In my experience, hardly any source files require studio.h

stddef.h on the other hand is required by most to get size_t