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

        Expression child =  getChild();
        if (child.evaluate(tuple, ptr)) {
            PDataType childType = child.getDataType();
            childType.coerceBytes(ptr, childType, child.getColumnModifier(), null);
            BigDecimal value = (BigDecimal) childType.toObject(ptr);
            value = value.round(getMathContext());
            byte[] b = childType.toBytes(value, child.getColumnModifier());
            ptr.set(b);
            return true;
        }
        return false;

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    d = new BigDecimal(1.2d, mc);
    d = d.add(d, mc);
    d = d.divide(d, mc);
    d = d.multiply(d, mc);
    d = d.pow(2, mc);
    d = d.round(mc);
    d = d.setScale(1);
    d = d.subtract(d, mc);
  }
}

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        }


        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, compat = CompatVersion.RUBY1_8)

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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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            return newInfinity(context.runtime, sign1 * sign2);
        }


        BigDecimal res = value.multiply(val.value);
        // FIXME: rounding mode should not be hard-coded. See #mode.
        if (res.precision() > digits) res = res.round(new MathContext(digits,  RoundingMode.HALF_UP));


        return new RubyBigDecimal(context.runtime, res).setResult();
    }
    
    // Calculate appropriate zero or infinity depending on exponent...

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      BigDecimal x = new BigDecimal(root, nMC);
      x = x.multiply(halfBack, nMC);              // x0 ~ sqrt()
      if (scale != 0) x = x.movePointLeft(scale);


      if (prec < nInit) {                // for prec 15 root x0 must surely be OK
          return x.round(rootMC);        // return small prec roots without iterations
      }


      // Initial v - the reciprocal
      BigDecimal v = BigDecimal.ONE.divide(TWO.multiply(x), nMC);        // v0 = 1/(2*x)

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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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        }


        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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