libjava/testsuite/libjava.lang/CompareNaN.java

   1 /*
   2  * JLS 4.2.3 specifies that (x op y) must be false if either x or y
   3  * is NaN and op is one of <, >, <=, >=, or ==.
   4  *
   5  * Some targets may need specific options wired into libgcj.spec
   6  * to pass this test.  For example, alpha-linux requires -mieee
   7  * to prevent an unrecoverable fp trap.
   8  */
   9
  10 public class CompareNaN {
  11   public static void main(String[] args) {
  12     double x = Double.NaN;
  13     System.out.println(x == x);
  14   }
  15 }