1 /* This is the example given and commented on the MPFR web site:
2 * https://www.mpfr.org/sample.html
3 */
4
5 /*
6 Copyright 1999-2004, 2006-2023 Free Software Foundation, Inc.
7 Contributed by the AriC and Caramba projects, INRIA.
8
9 This file is part of the GNU MPFR Library.
10
11 The GNU MPFR Library is free software; you can redistribute it and/or modify
12 it under the terms of the GNU Lesser General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or (at your
14 option) any later version.
15
16 The GNU MPFR Library is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
18 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
19 License for more details.
20
21 You should have received a copy of the GNU Lesser General Public License
22 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
23 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
24 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
25 */
26
27 #include <stdio.h>
28
29 #include <gmp.h>
30 #include <mpfr.h>
31
main(void)32 int main (void)
33 {
34 unsigned int i;
35 mpfr_t s, t, u;
36
37 mpfr_init2 (t, 200);
38 mpfr_set_d (t, 1.0, MPFR_RNDD);
39 mpfr_init2 (s, 200);
40 mpfr_set_d (s, 1.0, MPFR_RNDD);
41 mpfr_init2 (u, 200);
42 for (i = 1; i <= 100; i++)
43 {
44 mpfr_mul_ui (t, t, i, MPFR_RNDU);
45 mpfr_set_d (u, 1.0, MPFR_RNDD);
46 mpfr_div (u, u, t, MPFR_RNDD);
47 mpfr_add (s, s, u, MPFR_RNDD);
48 }
49 printf ("Sum is ");
50 mpfr_out_str (stdout, 10, 0, s, MPFR_RNDD);
51 putchar ('\n');
52 mpfr_clear (s);
53 mpfr_clear (t);
54 mpfr_clear (u);
55 mpfr_free_cache ();
56 return 0;
57 }
58