### Question 5.10

But wouldn't it be better to use `NULL` (rather than `0`), in case the value of `NULL` changes, perhaps on a machine with nonzero internal null pointers?

No. (Using `NULL` may be preferable, but not for this reason.) Although symbolic constants are often used in place of numbers because the numbers might change, this is not the reason that `NULL` is used in place of `0`. Once again, the language guarantees that source-code `0`'s (in pointer contexts) generate null pointers. `NULL` is used only as a stylistic convention. See questions 5.5 and 9.2.

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