functions in c

Question

whats the diff between
void add( ) and void add(void)

Answer 1

They are the same; however if you use void add() as a function declaration, the function can take parameters, so the actual function definition might look like this: void add(int *a, int *b) { (...) } whereas if you use void add(void) as a function declaration, the function can't take parameters and if the function definition includes parameters, the code won't compile