CELL subtract_ratio(CELL x, CELL y);
CELL multiply_ratio(CELL x, CELL y);
CELL divide_ratio(CELL x, CELL y);
+CELL divfloat_ratio(CELL x, CELL y);
CELL less_ratio(CELL x, CELL y);
CELL lesseq_ratio(CELL x, CELL y);
CELL greater_ratio(CELL x, CELL y);