Unexpected output of a simple GMP program

[Jiri Simsa]

Got it. Thanks for a quick answer.

--Jiri


On Sat, Jul 27, 2013 at 12:58 PM, Marc Glisse <marc.glisse at inria.fr> wrote:

> On Sat, 27 Jul 2013, Jiri Simsa wrote:
>
>  Hello,
>>
>> I am trying to use GMP in my project and to familiarize myself with GMP, I
>>
>
> For any new project that requires bigfloats, it is better to use mpfr (it
> uses gmp internally).
>
>
>  wrote some simple programs. For one of them, I am seeing unexpected
>> behavior and I am not sure what am I doing wrong.
>>
>> Here is the example in question:
>> #include <gmp.h>
>> int main() {
>>  mpf_t x;
>>  mpf_init(x);
>>  mpf_set_si(x, 1);
>>  gmp_printf("x = %F\n", x);
>>
>
> The examples in the manual use %Ff.
>
>
>   mpf_set_ui(x, 1);
>>  gmp_printf("x = %F\n", x);
>>  mpf_set_d(x, 1.0);
>>  gmp_printf("x = %F\n", x);
>>  mpf_clear(x);
>>  return 0;
>> }
>>
>> I compile this program with:
>> g++ -o test test.c -lgmp
>>
>> When I run it, I see:
>> x = 0.000000
>> x = 0.000000
>> x = 1.000001
>>
>> While I would expect to see:
>> x = 1.000000
>> x = 1.000000
>> x = 1.000000
>>
>> Could someone please let me know why the actual output differs from my
>> expectation? Thanks.
>>
>
> --
> Marc Glisse
>