Examples of java.math.BigInteger.pow()

java.math.BigInteger.pow()
Returns a BigInteger whose value is (this^exponent). Note that {@code exponent} is an integer rather than a BigInteger. @param exponent exponent to which this BigInteger is to be raised. @return this^exponent @throws ArithmeticException {@code exponent} is negative. (This wouldcause the operation to yield a non-integer value.)

      return BigInteger.valueOf(LongMath.sqrt(x.longValue(), mode));
    }
    BigInteger sqrtFloor = sqrtFloor(x);
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(sqrtFloor.pow(2).equals(x)); // fall through
      case FLOOR:
      case DOWN:
        return sqrtFloor;
      case CEILING:
      case UP:

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      case FLOOR:
      case DOWN:
        return sqrtFloor;
      case CEILING:
      case UP:
        return sqrtFloor.pow(2).equals(x) ? sqrtFloor : sqrtFloor.add(BigInteger.ONE);
      case HALF_DOWN:
      case HALF_UP:
      case HALF_EVEN:
        BigInteger halfSquare = sqrtFloor.pow(2).add(sqrtFloor);
        /*

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      return BigInteger.valueOf(LongMath.sqrt(x.longValue(), mode));
    }
    BigInteger sqrtFloor = sqrtFloor(x);
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(sqrtFloor.pow(2).equals(x)); // fall through
      case FLOOR:
      case DOWN:
        return sqrtFloor;
      case CEILING:
      case UP:

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      case FLOOR:
      case DOWN:
        return sqrtFloor;
      case CEILING:
      case UP:
        return sqrtFloor.pow(2).equals(x) ? sqrtFloor : sqrtFloor.add(BigInteger.ONE);
      case HALF_DOWN:
      case HALF_UP:
      case HALF_EVEN:
        BigInteger halfSquare = sqrtFloor.pow(2).add(sqrtFloor);
        /*

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  private BigInteger num;


  @Override
  public void init(Object... inits) {
    BigInteger i = new BigInteger("2");
    num = i.pow(1000);
  }


  @Override
  public void solve() {
    String s = num.toString();

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    byte aBytes[] = {1, 2, 3, 4, 5, 6, 7};
    int aSign = 1;
    int exp = -5;
    BigInteger aNumber = new BigInteger(aSign, aBytes);
    try {
      aNumber = aNumber.pow(exp);
      fail("ArithmeticException has not been caught");
    } catch (ArithmeticException e) {
      assertEquals("Improper exception message", "Negative exponent",
          e.getMessage());
    }

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        byte aBytes[] = {1, 2, 3, 4, 5, 6, 7};
        int aSign = 1;
        int exp = -5;
        BigInteger aNumber = new BigInteger(aSign, aBytes);
        try {
            aNumber.pow(exp);
            fail("ArithmeticException has not been caught");
        } catch (ArithmeticException e) {
            assertEquals("Improper exception message", "Negative exponent", e.getMessage());
        }
    }

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  public void testSqrtFloor() {
    for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
      for (RoundingMode mode : asList(FLOOR, DOWN)) {
        BigInteger result = BigIntegerMath.sqrt(x, mode);
        assertTrue(result.compareTo(ZERO) > 0);
        assertTrue(result.pow(2).compareTo(x) <= 0);
        assertTrue(result.add(ONE).pow(2).compareTo(x) > 0);
      }
    }
  }

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  public void testSqrtCeiling() {
    for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
      for (RoundingMode mode : asList(CEILING, UP)) {
        BigInteger result = BigIntegerMath.sqrt(x, mode);
        assertTrue(result.compareTo(ZERO) > 0);
        assertTrue(result.pow(2).compareTo(x) >= 0);
        assertTrue(result.signum() == 0 || result.subtract(ONE).pow(2).compareTo(x) < 0);
      }
    }
  }

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  // Relies on the correctness of sqrt(BigInteger, FLOOR).
  public void testSqrtExact() {
    for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
      BigInteger floor = BigIntegerMath.sqrt(x, FLOOR);
      // We only expect an exception if x was not a perfect square.
      boolean isPerfectSquare = floor.pow(2).equals(x);
      try {
        assertEquals(floor, BigIntegerMath.sqrt(x, UNNECESSARY));
        assertTrue(isPerfectSquare);
      } catch (ArithmeticException e) {
        assertFalse(isPerfectSquare);

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