Can you mix old-style and new-style function syntax?

C Interview Questions and Answers

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Can you mix old-style and new-style function syntax?

Doing so is legal (and can be useful for backwards compatibility), but requires a certain amount of care . Modern practice, however, is to use the prototyped form in both declarations and definitions. (The old-style syntax is marked as obsolescent, so official support for it may be removed some day.)

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