SetPrecision
 Usage
• SetPrecision[expr, p] yields a version of expr in which all numbers have been set to have precision p.
Notes
• When SetPrecision is used to increase the precision of a number, the number is padded with zeros. The zeros are taken to be in base 2. In base 10, the additional digits are usually not zero. • SetPrecision returns an arbitrary-precision number, even if the precision requested is less than $MachinePrecision. • SetPrecision[expr, MachinePrecision] converts all numbers in expr to machine precision. • If expr contains machine-precision numbers, SetPrecision[expr, p] can give results which differ from one computer system to another. • SetPrecision will first expose any hidden extra digits in the internal binary representation of a number, and only after these are exhausted add trailing zeros. • 0.004`25 generates a number with all trailing digits zero and precision 25 on any computer system. • SetPrecision[expr, p] does not modify expr itself. • New in Version 2; modified in 5.
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