#include <stdio.h>

char *str[] = { "bit 0", "bit 1", "bit 2", "bit 3", "bug" };

static inline int __next_bit(unsigned int active_bases, int bit)
{
	do {
		if (active_bases & (1 << bit))
			return bit;
	} while (++bit < 4);

	printf("BUG\n");
	/* We should never reach here */
	return 0;
}

#define for_each_active_base(_bit, _base, _cpu_base, _active_bases)	\
	for ((_active_bases) = active_bases, _bit = -1;			\
		(_active_bases) &&					\
		((_bit) = __next_bit(_active_bases, ++_bit),		\
		(_base) = (_cpu_base) + _bit);				\
		(_active_bases) &= ~(1 << (_bit)))

void main (void)
{
	unsigned int active_bases, active_bases1;
	int bit;
	char **base;

	printf("Enter number\n");
	scanf("%u", &active_bases);

	for_each_active_base(bit, base, str, active_bases1)
		printf("%s\n", *base);
}