Thread: differently or not?

hello,
tell me please, if two different ways to using struct or not?
funclion called in head source file like this...

Code:

static void func(struct a *);

next I need use it.
which's way would be most good?

Code:

//1
 func(struct a *p){
..
}
//2
 func(p)
 struct  a *p;
{
..
}