C/ c++:包含int和enum = sizeof(int)的typedef结构体的大小?

I am using gcc version 4.3.3 on my Ubuntu (i686). I have written a stripped down test program to describe my lack of understanding and my problem. The program shall tell me the size of the struct, which I implemented. So I have a I am using gcc version 4.3.3 on my Ubuntu (i686