IEEE 754 double precision can represent numbers with about 16 decimal digits of precision, however Google calculator (from anecdotal evidence) seems to only rel

IEEE 754 double precision can represent numbers with about 16 decimal digits of precision, however Google calculator (from anecdotal evidence) seems to only reliably represent numbers with 14 of precision (ex. http://www.google.com/search?q=99999999999999+-+99999999999997 http://www.google.com/search?q=99999999999999+-+999999999999...) Interestingly, for pure decimal operations it seems some other floating point representation is used. For example, http://www.google.com/search?q=1.0+-+0.2+-+0.2+-+0.2+-+0.2+-+0.2 http://www.google.com/search?q=1.0+-+0.2+-+0.2+-+0.2+-+0.2+-... returns mathematically correct result of zero. If double precision were being used it should return the mathematically incorrect result of 0.0000000000000000555 because of floating point representations errors.