Z
#define Z(FLAG) if (hint->ai_flags & AI_##FLAG) fprintf(stderr, "%s%s", sep, #FLAG), sep = "|"
#define Z(I) (&((char *)point_array)[(3 * (I) + 2) * felem_size])
#define Z { 0 }
#define Z(fld) {t = s.nchstats.fld; s.nchstats.fld -= s1.nchstats.fld; \