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

[Luís B. <lf...@ya...>]

Hi there…

I’ve just finished developing an mathematical
optimization program 
in C++ for my Thesis. My base compiler that was
installed in my university was Microsoft Visual 
C++.Net. Now I’m trying to compile with Dev-Cpp in my 
computer at home . The results were the same, until
my example 23, failed to converge in Dev-Cpp. When 
dealing with math every decimal counts. And this is
the problem. The results are the following:

----------------------------------
Iteration function
          error
          next step

--------NET-----------------------------DEV----------

0   6.08269457903887380000    6.08269457903887380000 
   14.38658488183035000000   14.38658488183034500000
    1.00000000000000000000    1.00000000000000000000

1   6.08269457903887380000    6.08269457903887380000
   14.38658488183035000000   14.38658488183034500000
    0.15334071686133940000    0.15334071686133718000

2   5.64283384487765800000    5.64283384487766430000
   11.71651970320963600000   11.71651970320965800000
    0.23998975404550715000    0.23998975404523476000

3   5.29623368056405490000    5.29623368056461440000
    9.25439173550483750000    9.25439173550664760000
    0.13589203600495686000    Error.

As you can in iteration 3 the program fails. I know 
that is difficult to find the problem just by looking 
at numbers!! The difference is always in the last 
decimal places (>12). 

I use templates in all class’s and it’s being 
initialize with double. My compilation options are 
default. My computer is a Pentium 3. I think its 
probably the double that has different 
decimal places? I’ve changed to (long double) but the 
function pow in math doesn’t accept anything 
different from double. Even converting to double 
the results are the same.

Thanks in advance for any help.

P.S. Sorry for my bad English


=====
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
Luís Filipe Delgado Brás
lf...@ya...
http://www.fotopt.net/autor.asp?autor=2637
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=

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