C / GCC - What does 'at top level' refer to?

Question

This feels stupid to ask but I don't know the answer.

I've tried googling what I wrote as the question but nothing I answered my question. I also tried searching StackOverflow specifically as well.

When compiling code with gcc –Wall.

What does the 'At top level' refer to :

exam06.c: At top level:

Answer 1

In the global scope, i.e. not in any other scope, such as a structure definition, function implementation, etc.

int globalInt = 0; // <--- at the "top level"

void someFunction() { // <--- at the "top level"
    int localInt = 0; // <--- in the function's scope
}