@elextr just want to mention that usually no one use such prototypes, usually parameters names present in prototypes;
In C++ it's common to leave a parameter name out even in the function definition, as @elextr to avoid "unused parameter" warnings (e.g. when overriding a method, or writing a callback function or some other things with a forced signature).
In C it's a little less common to see prototypes without parameter names, but it isn't rare either, some people use this style in all headers.