use strict;
use warnings;

use Math::MPFR qw(:mpfr);
use Math::GMPf qw(:mpf);
use Math::GMPq qw(:mpq);

my $PREC = 128;

# Compute log(3)
my $fr = Rmpfr_init2($PREC);
Rmpfr_set_ui($fr, 3, MPFR_RNDN);
Rmpfr_log($fr, $fr, MPFR_RNDN);

print "$fr\n";    # print as float

# MPFR -> floating-point
my $f = Rmpf_init2($PREC);
Rmpfr_get_f($f, $fr, MPFR_RNDN);

# floating-point -> rational
my $q = Rmpq_init();
Rmpq_set_f($q, $f);

print "$q\n";     # print as rational