}
    if (radix < Character.MIN_RADIX || radix > Character.MAX_RADIX) {
      throw new NumberFormatException("illegal radix: " + radix);
    }

    int maxSafePos = ParseOverflowDetection.maxSafeDigits[radix] - 1;
    long value = 0;
    for (int pos = 0; pos < string.length(); pos++) {
      int digit = Character.digit(string.charAt(pos), radix);
      if (digit == -1) {

    for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
      radixEncodeParseAndAssertEquals(0, radix);
      radixEncodeParseAndAssertEquals(8000, radix);
      radixEncodeParseAndAssertEquals(-8000, radix);
      radixEncodeParseAndAssertEquals(GREATEST, radix);
      radixEncodeParseAndAssertEquals(LEAST, radix);

  }

  /**
   * Returns a string representation of the {@code UnsignedLong} value, in base {@code radix}. If
   * {@code radix < Character.MIN_RADIX} or {@code radix > Character.MAX_RADIX}, the radix {@code
   * 10} is used.
   */
  public String toString(int radix) {
    return UnsignedLongs.toString(value, radix);
  }

  }

  /**
   * Returns a string representation of the {@code UnsignedInteger} value, in base {@code radix}. If
   * {@code radix < Character.MIN_RADIX} or {@code radix > Character.MAX_RADIX}, the radix {@code
   * 10} is used.
   */
  public String toString(int radix) {
    return UnsignedInts.toString(value, radix);
  }

  @GwtIncompatible // too slow
  public void testToStringRadix() {
    for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
      for (int l : TEST_INTS) {
        UnsignedInteger value = UnsignedInteger.fromIntBits(l);
        assertThat(value.toString(radix)).isEqualTo(value.bigIntegerValue().toString(radix));
      }
    }
  }

  public void testToStringRadixQuick() {

    // loops through all legal radix values.
    for (int r = Character.MIN_RADIX; r <= Character.MAX_RADIX; r++) {
      int radix = r;
      // tests can successfully parse a number string with this radix.
      String maxAsString = max.toString(radix);
      assertThat(UnsignedLongs.parseUnsignedLong(maxAsString, radix)).isEqualTo(max.longValue());

      assertThrows(

    for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
      radixEncodeParseAndAssertEquals(0, radix);
      radixEncodeParseAndAssertEquals(8000, radix);
      radixEncodeParseAndAssertEquals(-8000, radix);
      radixEncodeParseAndAssertEquals(GREATEST, radix);
      radixEncodeParseAndAssertEquals(LEAST, radix);

  public void testTryParse_radix() {
    for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
      radixEncodeParseAndAssertEquals(0L, radix);
      radixEncodeParseAndAssertEquals(8000L, radix);
      radixEncodeParseAndAssertEquals(-8000L, radix);
      radixEncodeParseAndAssertEquals(MAX_VALUE, radix);
      radixEncodeParseAndAssertEquals(MIN_VALUE, radix);
      assertWithMessage("Radix: " + radix)

   * @param string the string representation of an integer value
   * @param radix the radix to use when parsing
   * @return the integer value represented by {@code string} using {@code radix}, or {@code null} if
   *     {@code string} has a length of zero or cannot be parsed as an integer value
   * @throws IllegalArgumentException if {@code radix < Character.MIN_RADIX} or {@code radix >
   *     Character.MAX_RADIX}

   *
   * @param string the string representation of a long value
   * @param radix the radix to use when parsing
   * @return the long value represented by {@code string} using {@code radix}, or {@code null} if
   *     {@code string} has a length of zero or cannot be parsed as a long value
   * @throws IllegalArgumentException if {@code radix < Character.MIN_RADIX} or {@code radix >
   *     Character.MAX_RADIX}