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Why does dividing JSP / JSTL by 1000 sometimes give a remainder?

When dividing by 1000, I someday encounter an error that does not make the division “right”. For example, dividing 90.55 by 1000 instead of getting .09055 I get .090549999999.

<c:out value="${bean.paPrice / 1000}" />

Why is this happening? Is this the result of floating point math? It seems that a Google search showed that this could be a criminal, but I did not find a specific answer.

To fix this, I can round the answer to 5 digits, but it looks like this is just a patch for a deeper problem.

<fmt:formatNumber type="number" maxFractionDigits="5" value="${bean.paPrice / 1000}" />
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3 answers

This is not a problem, it is just a natural result of a binary floating-point representation. Summarize your values ​​and don't worry about it.

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Yes, this is a common floating point format .

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