/* From http://www.mpfr.org/sample.html */

#include <stdio.h>

#include <gmp.h>
#include <mpfr.h>

int main (void)
{
    unsigned int i;
    mpfr_t s, t, u;

    mpfr_init2 (t, 200);
    mpfr_set_d (t, 1.0, MPFR_RNDD);
    mpfr_init2 (s, 200);
    mpfr_set_d (s, 1.0, MPFR_RNDD);
    mpfr_init2 (u, 200);
    for (i = 1; i <= 100; i++)
        {
            mpfr_mul_ui (t, t, i, MPFR_RNDU);
            mpfr_set_d (u, 1.0, MPFR_RNDD);
            mpfr_div (u, u, t, MPFR_RNDD);
            mpfr_add (s, s, u, MPFR_RNDD);
        }
    printf ("Sum is ");
    mpfr_out_str (stdout, 10, 0, s, MPFR_RNDD);
    putchar ('\n');
    mpfr_clear (s);
    mpfr_clear (t);
    mpfr_clear (u);
    return 0;
}