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Message: [QUOTE="Michael Wojcik, post: 2382743"] A plausible interpretation; however, "zero" in your example is not a constant; hence it cannot be a null pointer constant (and indeed does not meet the C99 definition of a null pointer constant); hence this interpretation is irrelevant to the question at hand. The null pointer constant rules need only apply to null pointer constants, which are a special case of constants. And the standard says nothing about converting non-constant integer expressions that happen to have value 0. [/QUOTE]