Question ifdef macro question

Can one set up a valid ifdef with a similar arrangement to the below pseudocode in C?

I think the pre-processor will accept that, but unless you mean for your example not to be read literally, you're repeatedly defining the token 'macro' to mean a different thing. I can't remember if it will just be overwritten or if it will cause a conflict.

No, definitely wasn't meant to be read literally though in hindsight I can see why it might be. I'll fix it so it's clear I meant something like macro_a_n1 etc....

Thanks.

Then yup, that will definitely work!