#include <iostream>
#define foo 1<<16

#ifdef DEBUG
TYPE1 foo(void)
#else
int foo(void)
#endif
{ }

#define x(v) ((v))
# define x(v) ((v))
#  define x(v) ((v))

#if MACRO_WITH_STRING_ARG("hello \"world\"")
#elif MULTI_LINE /* comment */ < \
    EXPRESSION
int bar;
#endif  // comment

if (p) {
#ifdef DEBUG
    onething();
#endif
} else if (errno) {
#ifdef DEBUG
    anotherthing();
#endif
}

// this is a continued\
comment.
end