/* example #4 from ANSI C89 standard, 6.8.3.5 */

#define str(s)		# s
#define xstr(s)		str(s)
#define debug(s, t)	printf("x" # s "= %d, x" # t "= %s", \
			  x ## s, x ## t)
#define INCFILE(n)	vers ## n
#define glue(a, b)	a ## b
#define xglue(a, b)	glue(a, b)
#define HIGHLOW		"hello"
#define LOW		LOW ", world"

debug(1, 2);
fputs(str(strncmp("abc\0d", "abc", '\4')  /* this goes away */
   == 0) str(: @\n), s);
/* #include xstr(INCFILE(2).h) */
glue(HIGH, LOW);
xglue(HIGH, LOW)
