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I happened upon these values in my ColdFusion code but the Google calculator seems to have the same "bug" where the difference is non-zero.
416582.2850 - 411476.8100 - 5105.475 = -2.36468622461E-011
http://www.google.com/search?hl=en&rlz=1C1GGLS_enUS340US340&q=416582.2850+-+411476.8100+-+5105.475&aq=f&oq=&aqi=
JavaCast'ing these to long/float/double doesn't help- it results in other non-zero differences.
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Like addition, if you subtract 0 from any number, you get the same sum. For example, 12-0 = 12. If you're subtracting, you may need to use borrowing to solve the problem.
This is because decimal numbers that "look" round in base 10, are not exactly representable in base 2 (which is what computers use to represent floating point numbers). Please see the article What Every Computer Scientist Should Know About Floating-Point Arithmetic for a detailed explanation of this problem and workarounds.
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