Tower showing radiations

//Tower showing radiations
#include<stdio.h>
#include<conio.h>
#include<graphics.h>
void main()
{
 int i,j,gd=DETECT,gm,midx,midy;
 initgraph(&gd,&gm,"c:\\turboc3\\bgi");
 midx=getmaxx()/2;midy=getmaxy()/2;
 for(j=1;j<=6;j++)
 {
 for(i=j;i<=150;i++)
 {
 line(midx,midy,midx-50,midy+200);
 line(midx,midy,midx+50,midy+200);
 line(midx-25,midy+100,midx+25,midy+100);
 line(midx-25,midy+100,midx+50,midy+200);
 line(midx+25,midy+100,midx-50,midy+200);
 arc(midx+i,midy,-30,50,20+i);
 arc(midx-i,midy,120,200,20+i);
 if(i==150)
 break;
 clearviewport();
 }
 }
 getch();
 closegraph();
}