Examples of java.math.BigInteger.signum()

java.math.BigInteger.signum()
Returns the signum function of this BigInteger. @return -1, 0 or 1 as the value of this BigInteger is negative, zero orpositive.

   */
  static BigInteger randomPositiveBigInteger(int numBits) {
    BigInteger result;
    do {
      result = randomNonNegativeBigInteger(numBits);
    } while (result.signum() == 0);
    return result;
  }


  /**
   * Generates a number in [0, 2^numBits) with an exponential distribution.

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    while (true) {
      if (RANDOM_SOURCE.nextBoolean()) {
        return randomNonNegativeBigInteger(numBits);
      }
      BigInteger neg = randomNonNegativeBigInteger(numBits).negate();
      if (neg.signum() != 0) {
        return neg;
      }
    }
  }

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  @GwtIncompatible("java.math.BigInteger")
  public void testIsPowerOfTwo() {
    for (long x : ALL_LONG_CANDIDATES) {
      // Checks for a single bit set.
      BigInteger bigX = BigInteger.valueOf(x);
      boolean expected = (bigX.signum() > 0) && (bigX.bitCount() == 1);
      assertEquals(expected, LongMath.isPowerOfTwo(x));
    }
  }


  public void testLog2ZeroAlwaysThrows() {

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                    if (sign)
                        nn.diffSigns = true;


                    nn.minExponent = baseNode.minExponent;


                    if (baseExponent.signum() > 0 && baseExponent.compareTo(tempExponent) > 0)
                        baseNode.exponent = tempExponent;
                    else if (baseExponent.signum() < 0 && baseExponent.compareTo(tempExponent) < 0)
                        baseNode.exponent = tempExponent;
                    break;
                }

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                    nn.minExponent = baseNode.minExponent;


                    if (baseExponent.signum() > 0 && baseExponent.compareTo(tempExponent) > 0)
                        baseNode.exponent = tempExponent;
                    else if (baseExponent.signum() < 0 && baseExponent.compareTo(tempExponent) < 0)
                        baseNode.exponent = tempExponent;
                    break;
                }


                if (sign == null) {

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                        continue;


                    baseExponent = baseNode.exponent;
                    tempExponent = nn.exponent;


                    if (baseExponent.signum() != tempExponent.signum()) {
                        baseFactors.remove(j);
                        continue;
                    }


                    if (sign)

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        result.setGregorianChange(PURE_GREGORIAN_CHANGE);


        // if year( and eon) are undefined, leave default Calendar values
        BigInteger year = getEonAndYear();
        if (year != null) {
            result.set(Calendar.ERA, year.signum() == -1 ? GregorianCalendar.BC : GregorianCalendar.AD);
            result.set(Calendar.YEAR, year.abs().intValue());
        }


        // only set month if it is set
        if (month != DatatypeConstants.FIELD_UNDEFINED) {

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        result.setGregorianChange(PURE_GREGORIAN_CHANGE);


        // if year( and eon) are undefined, leave default Calendar values
        BigInteger year = getEonAndYear();
        if (year != null) {
            result.set(Calendar.ERA, year.signum() == -1 ? GregorianCalendar.BC : GregorianCalendar.AD);
            result.set(Calendar.YEAR, year.abs().intValue());
        } else {
            // use default if set
            BigInteger defaultYear = (defaults != null) ? defaults.getEonAndYear() : null;
            if (defaultYear != null) {

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            result.set(Calendar.YEAR, year.abs().intValue());
        } else {
            // use default if set
            BigInteger defaultYear = (defaults != null) ? defaults.getEonAndYear() : null;
            if (defaultYear != null) {
                result.set(Calendar.ERA, defaultYear.signum() == -1 ? GregorianCalendar.BC : GregorianCalendar.AD);
                result.set(Calendar.YEAR, defaultYear.abs().intValue());
            }
        }


        // only set month if it is set

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                        continue;


                    baseExponent = baseNode.exponent;
                    tempExponent = nn.exponent;


                    if (baseExponent.signum() != tempExponent.signum()) {
                        baseFactors.remove(j);
                        continue;
                    }


                    if (sign)

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