#include <stdio.h>

typedef enum { ST_OK, ST_FAIL, ST_FULL, ST_EMPTY } t_status;

int
main()
{
	t_status st = ST_OK;
	
	/* ... */
	switch (st)   {
		case ST_OK:
			break;
		case ST_FAIL:
			fprintf(stderr, "Error");
			break;
		case ST_FULL:
			/* ... */
			break;
		case ST_EMPTY:
			/* ... */
			break;
		default:
			printf("Hello");
			break;
	}
	return 0;
}