## token-pasting operator

Question

I was searching for this on the net but I still don't understand what is happening here:
What is the output of this code?
#define macro(r, a, b) b##a##r
#define CHAOS macro(r, a, b)
void CHAOS() { printf("order"); }
int main() {
bar();
return 0;
}

Answer 1

Coder Kitten thanks a lot.