When set, this option causes A-Shell to apply a rounding factor of .000005 (5 millionths) to the INT() and FIX() functions, and to the floating point comparison operators =, <>, <=, and >=. This fudge factor can be useful in programs that use floating point variables for dollars and cents computations without taking into proper account the fact that whenever floating point values are manipulated, they begin to accumulate tiny errors in precision. If the results of such expressions are not carefully rounded to the nearest penny, the errors can add up to the point that they become noticeable. This is particularly true with non-integers, which is why the SCALE option was invented in the original AlphaBASIC.

For more information on this subject, see Rounding of Floating Point Variables.