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/******************************************************
*
* zexy - implementation file
*
* copyleft (c) IOhannes m zmölnig
*
* 1999:forum::für::umläute:2004
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
/* get the n-th prime number */
#include "zexy.h"
static t_class *prime_class;
typedef struct _prime {
t_object x_obj;
} t_prime;
static void prime_float(t_prime *x, t_float f)
{
unsigned int i=f;
unsigned int max_divisor;
unsigned int divisor=1;
if (f<2){
outlet_float(x->x_obj.ob_outlet, 0.0);
return;
}
if (!(i%2)){
outlet_float(x->x_obj.ob_outlet, (t_float)(i==2));
return;
}
max_divisor = sqrt(f)+1;
while ((divisor+=2)<max_divisor)
if (!(i%divisor)) {
outlet_float(x->x_obj.ob_outlet, 0.0);
return;
}
outlet_float(x->x_obj.ob_outlet, 1.0);
}
static void *prime_new(void)
{
t_prime *x = (t_prime *)pd_new(prime_class);
outlet_new(&x->x_obj, &s_float);
return (x);
}
void prime_setup(void) {
prime_class = class_new(gensym("prime"),
(t_newmethod)prime_new,
0, sizeof(t_prime),
CLASS_DEFAULT, 0);
class_addfloat(prime_class, prime_float);
zexy_register("prime");
}
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