Examples of java.math.BigInteger.doubleValue()

java.math.BigInteger.doubleValue()
sun.com/docs/books/jls/second_edition/html/conversions.doc.html#25363">narrowing primitive conversion from {@code double} to{@code float} defined in the Java Language Specification: if this BigInteger has too great a magnitude to represent as a {@code double}, it will be converted to {@link Double#NEGATIVE_INFINITY} or {@link Double#POSITIVE_INFINITY} as appropriate. Note that even whenthe return value is finite, this conversion can lose information about the precision of the BigInteger value. @return this BigInteger converted to a {@code double}.

      BigInteger bi = squarD.unscaledValue();     // bi and scale are a tandem
      int biLen = bi.bitLength();
      int shift = Math.max(0, biLen - BITS + (biLen%2 == 0 ? 0 : 1));   // even shift..
      bi = bi.shiftRight(shift);                  // ..floors to 62 or 63 bit BigInteger


      double root = Math.sqrt(bi.doubleValue());
      BigDecimal halfBack = new BigDecimal(BigInteger.ONE.shiftLeft(shift/2));


      int scale = squarD.scale();
      if (scale % 2 == 1) {
          root *= SQRT_10;                        // 5 -> 2, -5 -> -3 need half a scale more..

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         }
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = new BigInteger(value);
         if(d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d;
      }

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         }
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = new BigInteger(value);
         if(d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d;
      }

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         result = u.toString();
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = (BigInteger)value;
         if (d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d.toString();
      }

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         result = u.toString();
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = (BigInteger)value;
         if (d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d.toString();
      }

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         }
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = new BigInteger(value);
         if(d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d;
      }

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         }
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = new BigInteger(value);
         if(d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d;
      }

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         result = u.toString();
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = (BigInteger)value;
         if (d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d.toString();
      }

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         result = u.toString();
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = (BigInteger)value;
         if (d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d.toString();
      }

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    harness.check(b1.byteValue() == b2.byteValue());
    harness.check(b1.shortValue() == b2.shortValue());
    harness.check(b1.intValue() == b2.intValue());
    harness.check(b1.longValue() == b2.longValue());  // see bug parade 4823171
    harness.check(b1.floatValue() == b2.floatValue());
    harness.check(b1.doubleValue() == b2.doubleValue());
  }
  
}

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