Difference between these two confusing function pointer notations in C?

Question

What is the difference between these two function pointer notations in C?

void (*a[]()) and void (*a)()[]

Do they both represent same - a as an array of pointers to functions - or does the second one represent a pointer to an array of functions?

How should I call these functions - say void (*a[]()) = {swap, add, sub, prod};?

Does that mean that a is an array of function pointers of 4 elements and swap, add, sub, prod's address are there in the a[0]...a[3]. How should I invoke these functions, like this?

*a[i]()

or like this?

a[i]()

Answer 1

Use cdecl.org to figure this stuff out until you can do it without thinking about it.

void (*a[]()): declare a as array of function returning pointer to void

whereas

void (*a)()[]: declare a as pointer to function returning array of void

The latter is invalid C.