Multiple #define within #ifdef or #ifndef

Question

This is a simple question, but I have not ran across similar code before to know the answer. Basically, am I allowed to have more than two #define in an #ifdef or #ifndef statement? For a basic example:

    #ifdef __GNUC__
        #define HELLO(x) x
        #define WORLD(y) y
    #else
        #define __attribute__(x)
        #define expect(expression, value) (expression)
    #endif

Thank you

Answer 1

Of course you are. This is perfectly valid.

You can have as many C statements or preprocessor directives within a preprocessor block as you want.

Answer 2

Yes, you may have as many preprocessor directives or just normal C++ statements between an #ifdef / #ifndef ... [ #else ]... #endif block as you want.

This is a simple enough question that you probably should have tried it before asking though.