text: #include<graphics.h>
  #include<conio.h>
  int main()
  {
   int gd=DETECT,gm;
   int x=320,y=240,radius;
   initgraph(&gd,&gm,"c:\\TC\\BGI");
   for(radius=25;radius<=125;radius=radius+20)
    circle(x,y,radius);
    getch();
    closegraph();
   return 0;
  }
  