[Bug classpath/90759] New: BigDecimal.toPlainString() gives wrong result for negative integer values

[guillerodriguez.dev at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90759

            Bug ID: 90759
           Summary: BigDecimal.toPlainString() gives wrong result for
                    negative integer values
           Product: classpath
           Version: 0.99
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: classpath
          Assignee: unassigned at gcc dot gnu.org
          Reporter: guillerodriguez.dev at gmail dot com
  Target Milestone: ---

BigDecimal.toPlainString() does not work as expected for negative integer
values if the scale is also < 0.

Here's a test case:

    bd = new BigDecimal(-10);
    bd = bd.stripTrailingZeros();
    System.out.println("toString(): " + bd);
    System.out.println("toPlainString(): " + bd.toPlainString());

    BigDecimal bd = new BigDecimal(new BigInteger("-1", 10), -1);
    System.out.println("toString(): " + bd);
    System.out.println("toPlainString(): " + bd.toPlainString());

This prints:

toString(): -1.E+1
toPlainString(): -1  // -> should be -10
toString(): -1.E+1
toPlainString(): -1  // -> should be -10