as : "a" value to string; bs : "b" value to string;
al : "a" string length; bl : "b" string length
ad : "a" decimal point; bd : "b" decimal point;
au : gold "a" upper value (integer); bu : "b" upper value (integer);
ab : "a" below value (integer); bb : "b" below value (integer);
ap : "a" # of places of decimal (integer); bp : "b" # of places of decimal (integer);
0.303과 0.0303은 다른 수이므로 자리수가 다름을 표시할 용도
ru : result upper value (integer); rb : result below value (integer)