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Accuracy Information
The calculator maintains valuesinternallyto greater
accuracythanthevaluesit displays. Occasionally,the
difference between a displayed numberanditsinternal value
can produce unexpected results.
Numeric
Anydisplayed numberis a rounded representationof an
Accuracy
internally stored 13-digit value. This internal value, not
the displayed number, is used during calculations.
Theadditional digits kept internally are referred to as
"guard digits.'' Although you can usually disregard
these digits, they can be importantin interpreting
unexpectedresults.
Asan exampleofthe effect of guard digits, it is possible
for an expression equal to zero to produce a nonzero
result (for example 1 =3x3-1).
Press
Display
1-13 x]
361)
Differencesin guard digits are especially importantif
you write a program that compares twovaluesfor
equality.
If you suspect these differences are responsible for an
unexpectedresult of a comparison, use the ROUND
numeric function before making the comparison. This
sets the internal value of the numberto the value shown
in thedisplay.
A-8
Reference Information
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