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From Buza Zoltán (JIRA) <>
Subject [jira] Created: (MATH-151) MathUtils.round incorrect result
Date Mon, 05 Jun 2006 15:22:29 GMT
MathUtils.round incorrect result

         Key: MATH-151
     Project: Commons Math
        Type: Bug

    Versions: 1.1 Final    
 Environment: Win2K, Sun JDK1.5.0_05 b05
    Reporter: Buza Zoltán

MathUtils.round(39.245, 2) results 39.24, however it should be 39.25, with default rounding
mode BigDecimal.ROUND_HALF_UP.

I found that internally MathUtils.round multiplies the given number by 10^scale.
 39.245 * 100.0 results 3924.49999...5 , and after this the calculation is not correct any

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