In a C function declaration, what does “…” as the last parameter do?

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It allows a variable number of arguments of unspecified type (like printf does).

You have to access the arguments with the va_start, va_arg and va_end functions.

See http://publications.gbdirect.co.uk/c_book/chapter9/stdarg.html or Where in the C standard variadic functions are described? for more information

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