/*
* ttyvaders Textmode shoot'em up
* Copyright (c) 2002 Sam Hocevar
* All Rights Reserved
*
* $Id: math.c,v 1.2 2002/12/22 23:01:35 sam Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "common.h"
int r00t( int a )
{
int x = a > 100000 ? 1000 : a > 1000 ? 100 : a > 10 ? 10 : 1;
if( a <= 0 )
{
return 0;
}
/* Newton's method. Three iterations would be more than enough. */
x = (x * x + a) / x / 2;
x = (x * x + a) / x / 2;
x = (x * x + a) / x / 2;
x = (x * x + a) / x / 2;
return x;
}