Syntax questions

Code:

---

struct foo {}
void bar(struct foo f) {}
void bar2(foo f) {}
void test(void) {}

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Is there a difference between having bar's parameter as "foo f" or "struct foo f"?
Is having void in test different from having no parameters at all?
If a function doesn't return anything, is it good practice to give it return as the last statement? E.g.

Code:

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void x()
{
        return;
}

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1. No
2. No
3. Matter of style, but I'd leave it out

You're missing a semicolon at the end of the struct definition.

Note that these questions may have different answers in C. They all seem to be related to differences between C and C++.