No defined type of a function parameter defaults to int? Am I insane?

Question

For some odd reason I was copying an example in another language of which does not use types, and forgot to add one in to a function definition parameter, and it worked.

Answer 1

K&R-style function declaration:

void foo(n) 
    int n; 
{

}

If type isn't specified, it defaults to int. This is valid in C89, not C99