1 /* Arithmetic. 2 Copyright (C) 2001-2002, 2006, 2009-2020 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2001. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _GCD_H 19 #define _GCD_H 20 21 #ifdef __cplusplus 22 extern "C" { 23 #endif 24 25 26 /* Return the greatest common divisor of a > 0 and b > 0. */ 27 extern unsigned long gcd (unsigned long a, unsigned long b); 28 29 30 #ifdef __cplusplus 31 } 32 #endif 33 34 #endif /* _GCD_H */ 35