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Message: [QUOTE="Eric Sosman, post: 3936117"] The scanf() stuff is explainable, at any rate: As you say, the excess arguments are evaluated, but not otherwise used if the format doesn't mention them (or if scanf() stops early for some other reason). The printf() thing is baffling, and all I can imagine is that it's not the real printf() and/or it's not the real n. Can you post a complete program, rather than just a snippet? (If it's somebody else's work, I'm not sure what the copyright situation might be ...) One other thing to try is the "-W" flag -- despite the name, gcc's "-Wall" does *not* turn on "all" diagnostics. [/QUOTE]