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 resul = x.multiply(new BigDecimal(n));
        /*
         * The estimation of the absolute error in the result is |n*err(x)|
         */
        MathContext mc = new MathContext(n.compareTo(BigInteger.ZERO) != 0 ? x.precision(): 0);
        return resul.round(mc);
    }


    /** Divide and round.
     * @param x The numerator
     * @param y The denominator

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        startAt.isGoodArgsCnt(1);
        BigDecimal n = number.get();
        //int digits=Math.abs(n.precision()-n.scale());
        //System.out.println("integer part:"+digits+", precision:"+number.precision());
        MathContext mc=context.get();
        return new Node(n.round(new MathContext(Math.max(n.precision(),mc.getPrecision()),mc.getRoundingMode())).stripTrailingZeros().toPlainString());
    }


    /**
     * Retourne le Decimal sous la forme d'une chaîne de caractères dans la Engineering (avec puissances de 10).
     *

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    public Node external_string_E(Node startAt) throws Exception {
        startAt.isGoodArgsCnt(1);
        BigDecimal n = number.get();
        int digits=BigDecimalMath.getIntDigitsCnt(n);
        MathContext mc=context.get();
        return new Node(n.round(new MathContext(digits+mc.getPrecision(),mc.getRoundingMode())).stripTrailingZeros().toEngineeringString());
    }


    /*
     *
     */

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         */
        BigDecimal r = number.get();
        for (int i = 1; i < asize; )
            r = r.subtract(_getArg_(startAt, i++));
        MathContext mc=context.get();
        return Node.createExternal(new External_Decimal(r.round(mc), mc));
    }


    /**
     * surcharge de l'opérateur -!
     *

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    // First limit the number of digits and then the precision.
    // Try and round to 29 digits because we can sometimes do that
    BigInteger allWordBigInt;
    allWordBigInt = destinationDecimal.unscaledValue();
    if (allWordBigInt.bitLength() > 96) {
      destinationDecimal = destinationDecimal.round(new MathContext(29));
      // see if 29 digits uses more than 96 bits
      if (allWordBigInt.bitLength() > 96) {
        // Dang. It was over 97 bits so shorten it one more digit to
        // stay <= 96 bits
        destinationDecimal = destinationDecimal.round(new MathContext(

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      destinationDecimal = destinationDecimal.round(new MathContext(29));
      // see if 29 digits uses more than 96 bits
      if (allWordBigInt.bitLength() > 96) {
        // Dang. It was over 97 bits so shorten it one more digit to
        // stay <= 96 bits
        destinationDecimal = destinationDecimal.round(new MathContext(
            28));
      }
    }
    // the bit manipulations above may change the scale so do it afterwards
    // round the scale to the max MS can support

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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)

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        sb.append(')');
    }
    if(parent!=null){
        double dis= DistanceMatrix.getDistanceFromPar(n, parent, par.cpar);
        BigDecimal bd = new BigDecimal(dis);
        String str=bd.round(new MathContext(3)).toString();
        sb.append(":");
        sb.append(str);
    }
}

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      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)


    // Collect iteration precisions beforehand

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    @Override
    public int sizePosition(Account account, DateTime time) {
        BigDecimal price = asset.priceAt(time);
        BigDecimal allocated = account.getCurrentAmount().multiply(ratio);
        BigDecimal shares = allocated.divide(price, 2, RoundingMode.HALF_UP);
        int i = shares.round(mc).intValue();


        return i;
    }
}

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