// This "almost" works but we can't use the preprocessor's arithmetic.
// We'd have to define our own.  Also there's no equivalent of a MOV,
// where you can use the value of one macro to define another, which
// makes it tricky to define your own arithmetic; you have to do it all
// with conditionals.
#ifndef BOTTLES
#define BOTTLES 99
#include "beer.h"
#else
#if BOTTLES == 0
No more bottles of beer on the wall,
No more bottles of beer!
Can't take one down, or pass it around,
Because there are no bottles of beer on the wall!
#else
#if BOTTLES == 1
One more bottle of beer on the wall,
One more bottle of beer!
Take it down, pass it around,
Now there's no bottles of beer on the wall!

#define BOTTLES 0
#include "beer.h"
#else
BOTTLES bottles of beer on the wall,
BOTTLES bottles of beer!
Take one down, pass it around,
#define BOTTLES BOTTLES-1
BOTTLES of beer on the wall!

#include "beer.h"
#endif
#endif
#endif