Re: [Dev-C++] Numerical Difference betewen Dev-Cpp and Microsoft C++.NET

[Ioannis V. <no...@ho...>]

In MINGW the long double is broken. Also in MINGW (and GCC in general) us=
e
-ffloat-store.=0D
=0D
 =0D
Ioannis Vranos=0D
=0D
* Programming pages: http://www.noicys.freeurl.com=0D
* Alternative URL: http://run.to/noicys =0D
-------Original Message-------=0D
 =0D
From: Lu=EDs" "Br=E1s=0D
Date: =D0=DD=EC=F0=F4=E7, 9 =C9=E1=ED=EF=F5=DC=F1=E9=EF=F2 2003 4:57:41 =F0=
=EC=0D
To: dev...@li...=0D
Subject: [Dev-C++] Numerical Difference betewen Dev-Cpp and Microsoft C++
NET=0D
 =0D
Hi there?=0D
=0D
I?ve just finished developing an mathematical=0D
optimization program =0D
in C++ for my Thesis. My base compiler that was=0D
installed in my university was Microsoft Visual =0D
C++.Net. Now I?m trying to compile with Dev-Cpp in my =0D
computer at home . The results were the same, until=0D
my example 23, failed to converge in Dev-Cpp. When =0D
dealing with math every decimal counts. And this is=0D
the problem. The results are the following:=0D
=0D
----------------------------------=0D
Iteration function=0D
error=0D
next step=0D
=0D
--------NET-----------------------------DEV----------=0D
=0D
0 6.08269457903887380000 6.08269457903887380000 =0D
14.38658488183035000000 14.38658488183034500000=0D
1.00000000000000000000 1.00000000000000000000=0D
=0D
1 6.08269457903887380000 6.08269457903887380000=0D
14.38658488183035000000 14.38658488183034500000=0D
0.15334071686133940000 0.15334071686133718000=0D
=0D
2 5.64283384487765800000 5.64283384487766430000=0D
11.71651970320963600000 11.71651970320965800000=0D
0.23998975404550715000 0.23998975404523476000=0D
=0D
3 5.29623368056405490000 5.29623368056461440000=0D
9.25439173550483750000 9.25439173550664760000=0D
0.13589203600495686000 Error.=0D
=0D
As you can in iteration 3 the program fails. I know =0D
that is difficult to find the problem just by looking =0D
at numbers!! The difference is always in the last =0D
decimal places (>12). =0D
=0D
I use templates in all class?s and it?s being =0D
initialize with double. My compilation options are =0D
default. My computer is a Pentium 3. I think its =0D
probably the double that has different =0D
decimal places? I?ve changed to (long double) but the =0D
function pow in math doesn?t accept anything =0D
different from double. Even converting to double =0D
the results are the same.=0D
=0D
Thanks in advance for any help.=0D
=0D
P.S. Sorry for my bad English=0D
=0D
=0D
=3D=3D=3D=3D=3D=0D
+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=
=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D=0D
Lu=EDs Filipe Delgado Br=E1s=0D
lf...@ya...=0D
http://www.fotopt.net/autor.asp?autor=3D2637=0D
+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=
=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D=0D
=0D
__________________________________________________=0D
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