hello all,
this is a program that draw bifurcation.
what do you think about that;
suggestion at frizzi@ghost.sm.dsi.unimi.it
 
 
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#include <stdio.h>
#include <conio.h>
#include <graphics.h>
 
#define   ITER1     500    /* definisce le iterazioni che filtrano gli
 attrattori */
#define   ITER2      90    /* definisce il numero di attrattori per ogni fascia
 */
 
double    x, r;
int       i, t, z, n;
 
void grafica(void)
{
   /* request auto detection */
   int gdriver = DETECT, gmode, errorcode;
 
   /* initialize graphics mode */
   initgraph(&gdriver, &gmode, "EGAVGA.BGI");
 
   /* read result of initialization */
   errorcode = graphresult();
 
   if (errorcode != grOk)  /* an error occurred */
   {
      printf("Graphics error: %s\n", grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
      exit(1);             /* return with error code */
   }
}
 
void main(void)
{
   grafica();
   r = 2.9;
   x = 0.4;
   n = 0;
   setfillstyle(SOLID_FILL, BLACK);
   bar(0, 0, 639, 479);
   settextstyle(2 , HORIZ_DIR, 12);
   outtextxy(5,5,"frizzi@ghost.sm.dsi.unimi.it");
   while (r <= 4)
   {
      for (i = 1; i < ITER1; i++)
        { x*=r*(1-x); }
      n++;
      for (i = 1; i < ITER2; i++)
        {
           x*=r*(1-x);
           putpixel((500*r)-1430, (440*x)+30, (n%15)+1);
           n++;
        }
        r+=0.001;
   }
        for(i=0;i<3;i++)
        {sound(800);delay(500);nosound();}
        outtextxy(2,470,"press any key to exit");
        while (!kbhit());
        getch();
        closegraph();
}
 <EOT>