Design Pattern in CG

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
void main()
{
 int gd=DETECT,gm,x,y,i;
 initgraph(&gd,&gm,"C:\\TurboC3\\BGI");
 x=getmaxx()/2,y=getmaxy()/2;
 for(i=0;i<=360;i=i+3)
 {
  delay(10);
  setcolor(i);
  arc(x-50,y-50,0+i,30+i,i);
 }
 getch();
 closegraph();
}