[Octave-bug-tracker] [bug #31135] Incorrect result when multiplicate two big numbers

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?31135>

                 Summary: Incorrect result when multiplicate two big numbers
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 26 Sep 2010 08:41:58 AM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: David Cerny
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.3
        Operating System: GNU/Linux

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Details:

I've done my own script for multiplication of two big numbers. I wanted to
check my result with result from octave, but I found out that octave is
actually wrong. 

Here are my tested numbers 

a=29039049309956
b=9977777778

printf(" %1.30e ", a*b);

But I received wrong result from octave on ~16th digit.

this is result from octave
2.897451808991252274216960000000e+23  
and this is result from ordinary calculator
2.897451808991252109577680000000e+23
                 ^here starts difference 







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