modules/up/src/gnug++/gcd.cc
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FUNCTIONS
This source file includes following functions.
- gcd
/*
Copyright (C) 1990 Free Software Foundation
written by Doug Lea (dl@rocky.oswego.edu)
This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version. This library is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef __GNUG__
#pragma implementation
#endif
#include <builtin.h>
/*
common functions on built-in types
*/
long gcd(long x, long y) // euclid's algorithm
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{
long a = abs(x);
long b = abs(y);
long tmp;
if (b > a)
{
tmp = a; a = b; b = tmp;
}
for(;;)
{
if (b == 0)
return a;
else if (b == 1)
return b;
else
{
tmp = b;
b = a % b;
a = tmp;
}
}
}