formatting floating point problem

formatting floating point problem

[Erwin Kalvelagen]

Hi,

I am wondering what I am doing wrong here.

erwin@erwin-laptop:~/jtest$ cat tst.java
public class tst {

	public static void main(String[] args) {
		double d = 0.8;
		System.out.format("[%g]%n",d);
	}
}
erwin@erwin-laptop:~/jtest$ gcj --main=tst tst.java
erwin@erwin-laptop:~/jtest$ ./a.out
[]
erwin@erwin-laptop:~/jtest$ gcj -v
Using built-in specs.
Reading specs from /usr/lib/gcc/i486-linux-gnu/4.4.3/libgcj.spec
rename spec startfile to startfileorig
rename spec lib to liborig
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.4.3-1ubuntu2'
--with-bugurl=file:///usr/share/doc/gcj-4.4/README.Bugs
--enable-languages=c,c++,java --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4
--program-suffix=-4.4 --enable-nls --enable-clocale=gnu
--disable-libmudflap --enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=//usr/lib/jvm/java-1.5.0-gcj-4.4/jre
--enable-java-home
--with-jvm-root-dir=//usr/lib/jvm/java-1.5.0-gcj-4.4
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.4
--with-arch-directory=i386
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-targets=all
--disable-werror --with-arch-32=i486 --with-tune=generic
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
--target=i486-linux-gnu
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-1ubuntu2)
erwin@erwin-laptop:~/jtest$


With Sun's java I get actually something printed.


Thanks, Erwin


----------------------------------------------------------------
Erwin Kalvelagen
Amsterdam Optimization Modeling Group
erwin@amsterdamoptimization.com
http://amsterdamoptimization.com
----------------------------------------------------------------

Re: formatting floating point problem

[Andrew Haley]

On 05/10/2010 12:19 AM, Erwin Kalvelagen wrote:

> I am wondering what I am doing wrong here.
> 
> erwin@erwin-laptop:~/jtest$ cat tst.java
> public class tst {
> 
> 	public static void main(String[] args) {
> 		double d = 0.8;
> 		System.out.format("[%g]%n",d);
> 	}
> }
> erwin@erwin-laptop:~/jtest$ gcj --main=tst tst.java
> erwin@erwin-laptop:~/jtest$ ./a.out
> []

Sorry, it looks like code to do that was never contributed to GNU Classpath.
Patches welcome.

Andrew.