java - Floating point arithmetic not producing exact results

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Answer 1

If you need exact decimal values, you should use java.math.BigDecimal. Then read "What Every Computer Scientist Should Know About Floating-Point Arithmetic" for the background of why you're getting those results.

(I have a .NET-centric article which you may find easier to read - and certainly shorter. The differences between Java and .NET are mostly irrelevant for the purposes of understanding this issue.)