Ubuntu
gcalctool package

does not handle conversion of negative decimal numbers to binary correctly (twos complement form).

Bug #151676 reported by James Ronald on 2007-10-11

6

Affects		Status	Importance	Assigned to	Milestone
	gcalctool (Ubuntu)	Invalid	Undecided	Unassigned

Bug Description

Binary package hint: gcalctool

gcalctool does not handle conversion of negative decimal numbers to binary correctly (twos complement form). For instance -1 decimal converted to a 16 bit binary would be 1111111111111111; similarly -128 would be 10000000. See the stupid windows calculator as it does the conversion correctly.

Thanks
James Ronald

ProblemType: Bug
Architecture: i386
Date: Thu Oct 11 15:32:28 2007
DistroRelease: Ubuntu 7.04
ExecutablePath: /usr/bin/gcalctool
Package: gcalctool 5.9.14-0ubuntu1
PackageArchitecture: i386
ProcCmdline: gcalctool
ProcCwd: /home/jronald
ProcEnviron:
SHELL=/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=en_US.UTF-8
SourcePackage: gcalctool
Uname: Linux jronald-desktop 2.6.20-16-generic #2 SMP Sun Sep 23 19:50:39 UTC 2007 i686 GNU/Linux

Revision history for this message

James Ronald (jronald) wrote on 2007-10-11:

#1

Dependencies.txt Edit (3.8 KiB, text/plain; charset="utf-8")
ProcMaps.txt Edit (21.6 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (665 bytes, text/plain; charset="utf-8")

Revision history for this message

James Ronald (jronald) wrote on 2007-10-11:

#2

Sorry, should be; similarly -128 would be 1111111110000000.

Revision history for this message

Cesare Tirabassi (norsetto) wrote on 2007-10-11:

#3

Works fine for me (AMD64):

&16 -128 ) Bin -> 1111111110000000
&16 -1 ) Bin -> 1111111111111111

Anyone else on i386 with the same problem?

Changed in gcalctool:
status:	New → Incomplete

Revision history for this message

Cesare Tirabassi (norsetto) wrote on 2007-10-12:

#4

Just tested on an i386 with the same (correct) results.
Can you please tell us what result you get and how?

Revision history for this message

Claude (clauder) wrote on 2007-11-28:

#5

I am on i386.

When I have -1 in decimal and click to hexadecimal, the result stays at -1. I search for a twos complement mode but could not find anything.

I am not if this is a bug or my lack of understanding how to do twos complement (btw, I am using 64 integer).

Revision history for this message

Cesare Tirabassi (norsetto) wrote on 2007-11-28:

#6

Can you try with the above keys combination?

Revision history for this message

Claude (clauder) wrote on 2007-11-28:

#7

Ok, now I get the same thing. I just did not understood what you meant. But I am using u64.....

But, how to do the opposite? I.e. go from an hex twos complement to a signed decimal?

Cesare Tirabassi (norsetto) on 2008-06-12

Changed in gcalctool:
status:	Incomplete → Invalid

Report a bug

This report contains Public information

Everyone can see this information.

You are

Subscribing...

Edit bug mail

Other bug subscribers

Bug attachments

Add attachment

Remote bug watches

Bug watches keep track of this bug in other bug trackers.