这个C程序如何成功编译和运行?

I was asked this in an interview. What will be the result of this program? I confidently said that this will not compile. I said that a is an array name and does not take up any space, so &a should not make any sense, hence this will not compile. but on hands-on, it turns out that compiles as well as runs successfully. Could someone please explain, how this works.I was asked this in an interview. What will be