Summary: SET DECIMALS TO 2 changes the result when a numeric expression that
evaluates to a decimal value is used in a comparison. For example, type the
following in the Command window:
SET DECIMAL TO 18
? 12/8888888 = 0 && FoxPro returns FALSE
SET DECIMALS TO 2
? 12/8888888 = 0 && FoxPro returns TRUE
Under dBASE IV, both of these expressions will return FALSE.
In FoxPro version 2.6a, a similar decimal-precision problem occurs when any whole number is used in math problems. For example: SET DECIMALS TO 18 ?12/8888888 && dBASE returns 0.00000135... but FoxPro returns 0 ?12/88888888 && dBASE returns 0.0000000000... but FoxPro returns 0 ?12.0/8888888 && dBASE returns 0.00000135... but FoxPro returns 0
However the behavior of FoxPro versions 2.5x, 2.6 and Visual FoxPro is closer to that of dBase. For example: SET DECIMALS TO 18 ?12/8888888 && FoxPro returns 0.000001350000135000 ?12/88888888 && FoxPro returns 0 ?12.0/8888888 && FoxPro returns 0.000001350000135000
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Manual ResolutionsIf you need greater precision in FoxPro, set the SET DECIMALS command to a higher value. For greater precision with constants, replace the constants with memory variables, so that FoxPro performs the calculation at run time.
If you must use constants, express them in the precision that is desired. For example, use this expression ?12.0000000/88888888 && FoxPro returns 0.00000135...
rather than this one: ?12/88888888 && FoxPro returns 0.0000000000...
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