Learning about macros in C

Question

I don't think macros are covered in the C tutorials. Anybody have a good recommendation for where to learn about them?
Thanks!

Answer 1

https://www.sololearn.com/learn/C/2957/

Answer 2

Thanks. That's helpful. I thought macro was a keyword.
I've looked at examples of macros now. But what exactly is a macro?

Also, can somebody please explain this code from the challenges.

#define macro(r,a,b)b##a##r
#define CHAOS macro(r,a,b)
void CHAOS(){
printf("order");
}
int main(){
bar();
return 0;
}

Answer 3

Anna , how do you get to the lessons? When I click on the link lessons from the app it shows all the quiz pages too. I like your link better; it's easier to scroll through the lesson.