C function syntax, parameter types declared after parameter list

Question

I'm relatively new to C. I've come across a form of function syntax I've never seen before, where the parameter types are defined after that parameter list. Can someone explain to me how it is different than the typical C function syntax?

Example:

int main (argc, argv)
int argc;
char *argv[];
{
return(0);
}

Answer 1

That's the old-style syntax for parameter lists, which is still supported. In K&R C you could also leave off the type declarations and they would default to int. i.e.

main(argc, argv)
char *argv[];
{
    return 0;
}

would be the same function.