Examples of java.math.BigDecimal.round()

java.math.BigDecimal.round()
Returns a {@code BigDecimal} rounded according to the{@code MathContext} settings. If the precision setting is 0 thenno rounding takes place.
The effect of this method is identical to that of the {@link #plus(MathContext)} method. @param mc the context to use. @return a {@code BigDecimal} rounded according to the {@code MathContext} settings. @throws ArithmeticException if the rounding mode is{@code UNNECESSARY} and the{@code BigDecimal} operation would require rounding. @see #plus(MathContext) @since 1.5

        }


        BigDecimal res = value.multiply(val.value);
        if (res.precision() > digits) {
            // TODO: rounding mode should not be hard-coded. See #mode.
            res = res.round(new MathContext(digits,  RoundingMode.HALF_UP));
        }
        return new RubyBigDecimal(runtime, res).setResult();
    }
    
    @JRubyMethod(name = {"**", "power"}, required = 1)

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        }


        for (int i = 0; i < values.size(); i++) {
            BigDecimal expected = values.get(i);
            BigDecimal actual = (BigDecimal)PDataType.DECIMAL.toObject(byteValues.get(i));
            assertTrue("For " + i + " expected " + expected + " but got " + actual,expected.round(PDataType.DEFAULT_MATH_CONTEXT).compareTo(actual.round(PDataType.DEFAULT_MATH_CONTEXT)) == 0);
            assertTrue(byteValues.get(i).length <= PDataType.DECIMAL.estimateByteSize(expected));
        }


        Collections.sort(values);
        Collections.sort(byteValues, Bytes.BYTES_COMPARATOR);

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        for (int i = 0; i < values.size(); i++) {
            BigDecimal expected = values.get(i);
            byte[] bytes = PDataType.DECIMAL.toBytes(values.get(i));
            assertNotNull("bytes converted from values should not be null!", bytes);
            BigDecimal actual = (BigDecimal)PDataType.DECIMAL.toObject(byteValues.get(i));
            assertTrue("For " + i + " expected " + expected + " but got " + actual,expected.round(PDataType.DEFAULT_MATH_CONTEXT).compareTo(actual.round(PDataType.DEFAULT_MATH_CONTEXT))==0);
        }




        {
            String[] strs ={

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         */
        double zerr = x.doubleValue() * x.ulp().doubleValue();
        MathContext mc = new MathContext(2 + err2prec(z.doubleValue(), zerr));


        /* Pull square root */
        z = sqrt(z.round(mc));


        /* Final rounding. Absolute error in the square root is x*xerr/z, where zerr holds 2*x*xerr.
         */
        mc = new MathContext(err2prec(z.doubleValue(), 0.5 * zerr / z.doubleValue()));
        return z.round(mc);

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        z = sqrt(z.round(mc));


        /* Final rounding. Absolute error in the square root is x*xerr/z, where zerr holds 2*x*xerr.
         */
        mc = new MathContext(err2prec(z.doubleValue(), 0.5 * zerr / z.doubleValue()));
        return z.round(mc);
    } /* BigDecimalMath.hypot */

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                    int pex = 1;
                    while (exsub-- > 0)
                        pex *= 10;
                    expxby10 = expxby10.pow(pex, mctmp);
                }
                return expxby10.round(mc);
            }
        }
    } /* BigDecimalMath.exp */


    /** The base of the natural logarithm.

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            /* error propagation: log(x+errx) = log(x)+errx/x, so the absolute error
             * in the result equals the relative error in the input, xUlpDbl/xDbl .
             */
            MathContext mc = new MathContext(err2prec(resul.doubleValue(), xUlpDbl / xDbl));
            return resul.round(mc);
        }
    } /* BigDecimalMath.log */


    /** The natural logarithm.
     * @param x the argument.

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             */
            MathContext mcloc = new MathContext(1 + err2prec(eps));


            final BigDecimal resul = log(r.BigDecimalValue(mcloc));


            return resul.round(mc);
        }
    } /* log */


    /** Power function.
     * @param x Base of the power.

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                 * The first derivative of sinh(x) is cosh(x), so the absolute error
                 * in the result is cosh(x)*errx, and the relative error is coth(x)*errx = errx/tanh(x)
                 */
                //double eps = Math.tanh(x.doubleValue());                                       // removed by l.bruninx, 2012-03-19
                //MathContext mc = new MathContext(err2prec(0.5 * x.ulp().doubleValue() / eps)); // removed by l.bruninx, 2012-03-19
                return resul.round(mc);
            }
            else {
                BigDecimal xhighpr = scalePrec(x, 2);
                /* Simple Taylor expansion, sum_{i=0..infinity} x^(2i+1)/(2i+1)! */
                BigDecimal resul = xhighpr;

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             * The absolute error in arcsinh x is err(x)/sqrt(1+x^2)
             */
            double xDbl = x.doubleValue();
            double eps = 0.5 * x.ulp().doubleValue() / Math.hypot(1., xDbl);
            MathContext mc = new MathContext(err2prec(logx.doubleValue(), eps));
            return logx.round(mc);
        }
    } /* BigDecimalMath.asinh */


    /** The inverse hyperbolic cosine.
     * @param x The argument.

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