Problem whith Floating-point functions

[Armando Garcia B.]

Dear Sirs:

I have builded a little program using GNU MP in a Linux RedHat 6.2
system runing in a Pentium II 400 MHz machine (Dell Precision
Worksatation 410).

This simple program just asign a decimal number to a mpf_t variable and
then the variable content is converted to a string. Finally the string
is printed to the standard output.

The program is:

#include <stdio.h>
#include <gmp.h>

main()
{
  mpf_t x;
  mp_exp_t exp;

  mpf_init_set_d( x, 0.001 );   /* x  = 0.001 */

  mpf_get_str( NULL, &exp, 10, 0, x );
  printf( "x(mpf_get_str)=%s(%ld)\n", mpf_get_str( NULL, &exp, 10, 0, x
), exp );

  exit( 0 );
}

and I compile the program as follows:

gcc -o testgmp testgmp.c -lgmp


Note that I'm using a 0 in the 4th parameter of the mpf_get_str function
to get all the significative digits.



The result for this program is:

x(mpf_get_str)=100000000000000002082(-2)
                                                            ^^^^



However, I was expecting "1(-2)" instead of "100000000000000002082(-2)",
ie, only zeros after the number 1.

Coud you please help me in this matter?

My best regards,


Armando Garcia Brown.