RAINBOW THROUGH COMPUTER GRAPHICS

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
 #include<dos.h>
void main()
{
 int gd=DETECT,gm,x,y,i;
 initgraph(&gd,&gm,"c\\tc\bin");
 x=getmaxx()/2;
 y=getmaxy()/2;
 for(i=30;i<200;i++)
 {
 delay(100);
 setcolor(i/10);

 arc(x,y,0,180,i-10);
 }
 getch();
 closegraph() ;

 }