] gives the number of digits to the right of the decimal point in the number x.
If x is not a number, Accuracy[
] gives the minimum value of Accuracy for all the numbers that appear in x.
Accuracy gives Infinity when applied to exact numbers, such as integers.
Accuracy assumes a precision of $MachinePrecision when applied to machine-precision numbers.
Accuracy can yield a negative result.
See the Mathematica book: Section 3.1.4.
See also: Precision, N, Chop, SetAccuracy.
The Accuracy of an exact number is infinite.
The Accuracy of a machine real number depends on the value of $MachinePrecision on your computer.
However, the Accuracy of arbitrary-precision real numbers is machine-independent.
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