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From: nejataydin@superonline.com To: gcc-gnats@gcc.gnu.org Subject: c++/4434: the value of float epsilon is wrong Date: Mon, 01 Oct 2001 06:16:00 -0000 [thread overview] Message-ID: <200110011310.f91DAgZ00969@localhost.localdomain> (raw) >Number: 4434 >Category: c++ >Synopsis: the value of float epsilon is wrong >Confidential: no >Severity: non-critical >Priority: medium >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Mon Oct 01 06:16:01 PDT 2001 >Closed-Date: >Last-Modified: >Originator: Nejat AYDIN >Release: 3.0.1 >Organization: >Environment: System: Linux localhost.localdomain 2.2.16-22 #1 Tue Aug 22 16:16:55 EDT 2000 i586 unknown Architecture: i586 host: i586-pc-linux-gnu build: i586-pc-linux-gnu target: i586-pc-linux-gnu configured with: ../src/gcc-3.0.1/configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man >Description: The command line is simply "g++ eps.cc" and there is no compiler output. Below is the source code (the file "eps.cc") /************************ Source Code ***********************/ #include <iostream> #include <limits> using namespace std; int main() { cout << "float epsilon == " << numeric_limits<float>::epsilon() << endl; cout << "double epsilon == " << numeric_limits<double>::epsilon() << endl; cout << "long double epsion == " << numeric_limits<long double>::epsilon() << endl; } /***************** End of Source Code *********************/ Output of the program is float epsilon == 2 double epsilon == 2.22045e-16 long double epsion == 1.0842e-19 which is the float epsilon is an obviously wrong value, while other epsilon values are plausible. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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