/*
* libcaca ASCII-Art library
* Copyright (c) 2002, 2003 Sam Hocevar
* All Rights Reserved
*
* $Id: math.c 185 2003-11-16 00:33:35Z sam $
*
* 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 "config.h"
#include
#include "caca.h"
#include "caca_internals.h"
int caca_rand(int min, int max)
{
return min + (int)((1.0*(max-min+1)) * rand() / (RAND_MAX+1.0));
}
unsigned int caca_sqrt(unsigned int a)
{
if(a == 0)
return 0;
if(a < 1000000000)
{
unsigned int x = a < 10 ? 1
: a < 1000 ? 10
: a < 100000 ? 100
: a < 10000000 ? 1000
: 10000;
/* 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;
}
return 2 * caca_sqrt(a / 4);
}