1  /* Arithmetic.
       2     Copyright (C) 2001-2002, 2006, 2009-2023 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 */