fizzbuzz_only_using_gotos.c

#include <stdio.h>

int
main(int argc, char **argv)
{
	int i;

	void *jump[] = {
		[0]       = &&printn,
		[1]       = &&fizz,
		[2]       = &&buzz,
		[3]       = &&fizzbuzz,
		[4 ... 7] = &&done
	};

#define NEXT do {              \
	i++;                       \
                               \
	goto *jump[(               \
		(!(i % 3))             \
		| ((!(i % 5)) << 1)    \
		| ((i > 100) << 2)     \
	)];                        \
} while (0)

	i = 0;

printn:
	printf("%d\n", i);
	NEXT;

fizz:
	puts("fizz");
	NEXT;

buzz:
	puts("buzz");
	NEXT;

fizzbuzz:
	puts("fizzbuzz");
	NEXT;

done:
	return 0;
}