ergo
pi.h
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1/* Ergo, version 3.8.2, a program for linear scaling electronic structure
2 * calculations.
3 * Copyright (C) 2023 Elias Rudberg, Emanuel H. Rubensson, Pawel Salek,
4 * and Anastasia Kruchinina.
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 *
19 * Primary academic reference:
20 * Ergo: An open-source program for linear-scaling electronic structure
21 * calculations,
22 * Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, and Anastasia
23 * Kruchinina,
24 * SoftwareX 7, 107 (2018),
25 * <http://dx.doi.org/10.1016/j.softx.2018.03.005>
26 *
27 * For further information about Ergo, see <http://www.ergoscf.org>.
28 */
29
38#ifndef PI_HEADER
39#define PI_HEADER
40
41#include "config.h" // need config.h to get PRECISION_QUAD_FLT128 macro
42
43/* ELIAS NOTE 2016-08-30: the numbers below were produced using the
44 quadmath library, by running the program in
45 source/standalone/pi_quadmath.c */
46
47#ifdef PRECISION_QUAD_FLT128
48
49/* __float128 case: use suffix 'Q' */
50#define pi 3.1415926535897932384626433832795028Q
51#define sqrtpi 1.7724538509055160272981674833411451Q
52#define pitopow52 17.4934183276248628462628216798715544Q
53
54#else
55
56/* regular, non-__float128 case: use suffix 'L' */
57#define pi 3.1415926535897932384626433832795028L
58#define sqrtpi 1.7724538509055160272981674833411451L
59#define pitopow52 17.4934183276248628462628216798715544L
60
61#endif
62
63#endif