#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <graphics.h>
void linetheta(float ang, int l, float *x, float *y) {
  float rad=3.14159/180,k1,k2;
  k1=l*cos(rad*ang); k2=l*sin(rad*ang); *x+=k1; *y+=k2;
  lineto(*x,*y);
}
void main() {
int    GraphDriver;             /* The Graphics device driver           */
int    GraphMode;               /* The Graphics mode value              */
struct point { int x,y; } p1,pp[40];
int radius,i,n,j,c;
float d,x,y,ang;

  printf("give me the fixed point--->"); scanf("%d %d",&p1.x,&p1.y);
  printf("give me the length -->"); scanf("%d",&radius);
  printf("give me the max polygon-->"); scanf("%d",&n);

  if (n < 3)  exit(1);  getche();

  GraphDriver = DETECT;  c=1;         /* Request auto-detection       */
  initgraph( &GraphDriver, &GraphMode, "" ); /* just increasing p1 - p2 */

  for (i=3; i<=n; i++) {
    ang=0.0; setcolor(c); x=p1.x; y=p1.y; moveto(x,y); d=360.0/i;
    for (j=0; j<i; j++) { /* draw polygon */
      linetheta(ang,radius,&x,&y); ang=fmod(ang+d,360); delay(2000);
    }
    c=(c++)%16;
  }

  getche(); closegraph();   /* Return the system to text mode       */
}