[CLN-list] More bugs.

[Isidro Cachadiña Gutiérrez]

El Martes, 14 de Diciembre de 2004 08:47, Isidro Cachadiña Gutiérrez escribió:

>
> Well.  Is this a bug and is it well reported? ..
> ---------------------------------------------------------------------------
>--------------- #include <iostream>
> #include <cln/float.h>
> #include <cln/float_io.h>
>
> using namespace cln;
> int main(int argc, char **argv)
> {
>
>   // Wrong result?
>
>   float_format_t prec;
>   prec=float_format(100);
>
>   cl_F a,b,c;
>   b=cl_float(1.0e-10,prec);
>   a=cl_float(1.0,prec);
>   c=a+b;
>
>   std::cerr << "Incorrect: " << std::endl;
>
>   std::cerr << "c=" << c << std::endl;
>   c=c-a;
>   std::cerr << "c=" << c << std::endl;
>
>   // Right result
>
>   std::cerr << "Correct:" << std::endl;
>
>   a="1.0_100";
>   b="1.0e-10_100";
>   c=a+b;
>
>   std::cerr << "c=" << c << std::endl;
>   c=c-a;
>   std::cerr << "c=" << c << std::endl;
>
> }
> ---------------------------------------------------------------------------
>----------- The output in my computer.
> ===================================================
> Incorrect:
> c=1.00000000010000000000000000364321973154977415791655470655996396089904010
>295867919921875L0
> c=1.00000000000000003643219731549774157916554706559963960899040102958679199
>21875L-10 Correct:
> c=1.0000000001L0
> c=9.99999999999999999999999999999999999999999999999999999999999999999999999
>9999999999999999999999999999999997972106604L-11
> ===================================================
>
> A ver si esta vez...

Well.  I answer myself.

This is a feature since the conversion is done at running time, then 1e-10 is 
stored as 1.000......3643e-10 and the cl_float anly can add zeroes.  But this 
functionality is good then perhaps a mix between a="number_<precision> " can 
be done :


for example 
   float_format_t prec;
   prec=float_format(100);

   a=cl_float("1.0e-10",prec);


a function 

cl_F cl_float(char *,float_format_t)

I haven't the documentation here now and I don't remenber if this function is 
implemented yet but I'll be happy if this functions is somewhere.

Thanks. 

 

-- 
***************************************************************************
*                    Dr. Isidro Cachadiña Gutiérrez                       * 
*                        Departamento de Física                           * 
*                         Facultad de Ciencias                            *
*                      Universidad de Extremadura                         *
*                        06071  Badajoz ( SPAIN )                         * 
*                         email: icacha at unex.es                           * 
*    Teléfono: +34 924 289 300 Ext. 6826     Fax: +34 924 289 651   *
***************************************************************************
* Usuario Linux: 8569         *
* Para clave pública GnuPG: http://onsager.unex.es/firma.pub.asc          *
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