#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <graphics.h>
#define MAX 40
void main() {
int    Driver, Mode;             /* The Graphics device driver           */
struct point { int x,y; } p1,poly[MAX];
int radius,i,k,j,n;
float d,x,y;

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

  Driver = DETECT;  initgraph( &Driver, &Mode, "" );
  d=2*3.14159/n; setcolor(4);
  for (i=0; i<=n; i++) {
	poly[i].x=x=p1.x+radius*cos(d*i); poly[i].y=y=p1.y+radius*sin(d*i);
	if (i == 0) moveto(x,y);
	else lineto(x,y);
  }
  for (i=0; i<n-2; i++)
	for (j=0; j<n-3; j++) {
	  k=(i+j+2)%n; setcolor(i%14+1);
	  if (k == 0) break;
	  line(poly[i].x,poly[i].y,poly[k].x,poly[k].y);
	}
  getche(); closegraph();   /* Return the system to text mode       */
}