In a C function declaration, what does "..." as the last parameter do?
it allows a variable number of arguments of unspecified type (like printf does).
you have to access them with va_start, va_arg and va_end
see http://publications.gbdirect.co.uk/c_book/chapter9/stdarg.html for more information
Variadic functions are functions which may take a variable number of arguments and are declared with an ellipsis in place of the last parameter. An example of such a function is
printf.A typical declaration is
int check(int a, double b, ...);Variadic functions must have at least one named parameter, so, for instance,
char *wrong(...);is not allowed in C.
The three dots '...' are called an ellipsis. Using them in a function makes that function a variadic function.To use them in a function declaration means that the function will accept an arbitrary number of parameters after the ones already defined.
For example:
Feeder("abc");Feeder("abc", "def");are all valid function calls, however the following wouldn't be:
Feeder();