Name: skT88420 Date: 05/27/99


import java.text.*;

class fmt
{
   public static void main (String args[])
   {
      System.out.println("Why does a value of .019 give 2% when a value of .009 gives 0%?\n");

      double d1 = .019;
      double d2 = .009;
      double d3 = .015;
      double d4 = .016;
      double d5 = .014;
      double d6 = .004;
      double d7 = .005;
      double d8 = .006;
      double d9 = .007;
      double d10 = .008;

      NumberFormat f1 = new DecimalFormat("##0%");

      System.out.println( d1 + " = " + f1.format(d1)); // should be 2%
      System.out.println( d2 + " = " + f1.format(d2)); // should be 1%
      System.out.println( d3 + " = " + f1.format(d3));
      System.out.println( d4 + " = " + f1.format(d4));
      System.out.println( d5 + " = " + f1.format(d5));
      System.out.println( d6 + " = " + f1.format(d6));
      System.out.println( d7 + " = " + f1.format(d7));
      System.out.println( d8 + " = " + f1.format(d8));
      System.out.println( d9 + " = " + f1.format(d9));
      System.out.println( d10 + " = " + f1.format(d10 ));

      System.out.println("\nI would have assumed a 1%");
   }
}


//E:\testjava\project16>java -version
//java version "1.2.1"
//HotSpot VM (1.0fcs, mixed mode, build E)

//E:\testjava\project16>java -fullversion
//java full version "JDK-1.2.1-A"
(Review ID: 83580)
======================================================================

Name: skT88420 Date: 10/01/99


java.text.DecimalFormat rounds doubles with 5 as a fraction digit inconsistently.

For example if double 0.05 is formatted using "#,##0.0", the result will be 0.0 (expected 0.1). But double 0.15 is formatted correctly: 0.2.

------------- SOURCE CODE --------------------
import java.text.*;

public class Test {
  public static void main(String[] args) {
    format (0.5, "#,##0", "1");
    format (1.5, "#,##0", "2");
    format (0.05, "#,##0.0", "0.1");
    format (0.15, "#,##0.0", "0.2");
    format (0.005, "#,##0.00", "0.01");
    format (0.015, "#,##0.00", "0.02");
    format (0.0005, "#,##0.000", "0.001");
    format (0.0015, "#,##0.000", "0.002");
  }
    
  public static void format (double d,
                             String format,
                             String expected) {
    DecimalFormat df = new DecimalFormat (format);
    System.out.println ("\nformatting double: " + d +
                        " (format: " + format + ")" +
                        "\nresult: " + df.format(d) +
                        " (expected: " + expected + ")");
  }
}
------------- END OF SOURCE ---------------------------

------------- OUTPUT ---------------------------
formatting double: 0.5 (format: #,##0)
result: 0 (expected: 1)

formatting double: 1.5 (format: #,##0)
result: 2 (expected: 2)

formatting double: 0.05 (format: #,##0.0)
result: 0.0 (expected: 0.1)

formatting double: 0.15 (format: #,##0.0)
result: 0.2 (expected: 0.2)

formatting double: 0.0050 (format: #,##0.00)
result: 0.00 (expected: 0.01)

formatting double: 0.015 (format: #,##0.00)
result: 0.02 (expected: 0.02)

formatting double: 5.0E-4 (format: #,##0.000)
result: 0.000 (expected: 0.001)

formatting double: 0.0015 (format: #,##0.000)
result: 0.002 (expected: 0.002)
-------------- END OF OUTPUT --------------------

OUTPUT OF java -version:
java version "1.2.2"
Classic VM (build JDK-1.2.2-W, native threads, symcjit)

OUTPUT OF java -fullversion:
JAVA.EXE full version "JDK-1.2.2-W"
(Review ID: 96002)
======================================================================