Date: Sun, 11 Jul 1999 19:22:57 +0900 From: SHUDO Kazuyuki <shudoh@muraoka.info.waseda.ac.jp> To: freebsd-java@FreeBSD.ORG Subject: Re: strange java calculation errors Message-ID: <199907111022.TAA17788@cafe.muraoka.info.waseda.ac.jp> In-Reply-To: Your message of "Fri, 09 Jul 1999 16:04:32 CST." <199907092204.QAA09955@mt.sri.com>
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> > > > >I use the latest jdk1.1.8_ELF.V99-6-3.tar.gz with applied net-patch.
> > > > >On a few-weeks-old 3.2-STABLE.
> > > > >I have strange arithmetic errors.
> > Ok, I set up a sample program. I think it needs to be an awt-application.
> > I don't get any errors without setVisible(), but with a visible frame
> > I get errors every few seconds. It has to be a Thread, too, I think.
> > Martin
> >
> > //BugTest.java ----------------------------------------------
I could simplify this code a bit.
Math.pow(...) returns a strange value occasionally.
Moving a mouse pointer on the frame seems to
increase the frequency of errors.
Kazuyuki SHUDO Happy Hacking!
Muraoka Lab., Grad. School of Sci. & Eng., Waseda Univ.
==========
import java.awt.*;
import java.util.Random;
public class BugTest extends Frame implements Runnable {
public BugTest(){
setSize(100,100);
setVisible(true);
}
public void run(){
double base, pow;
Random random = new Random();
while (true){
base = random.nextDouble() * 10.0;
pow = Math.pow(base, 3.9);
if (pow < 1.0e-200) {
System.out.println();
System.out.println("base: " + base +
" (0x" + Long.toHexString(Double.doubleToLongBits(base)) + ")");
System.out.println("pow: " + pow +
" (0x" + Long.toHexString(Double.doubleToLongBits(pow)) + ")");
}
}
}
public static void main(String args[]){
BugTest bug = new BugTest();
Thread bugThread = new Thread(bug);
bugThread.setPriority(Thread.MIN_PRIORITY);
bugThread.start();
}
}
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