运动的圆圈

#include "graphics.h"
#include "dos.h"
#include "conio.h"
#include "math.h"
void circles(int x,int y)
{
  int i;
  for (i=0;i<60;i++)
  {
 circle(x+60*cos(i),y+60*sin(i),20);
  }
}

void main()
{
  int gdriver=DETECT,gmode,y,i;
  initgraph(&gdriver,&gmode,"D:\\TC\\BGI");
  setcolor(15);
  for (i=0;;i++)
  {
 y=i;
 if (i==480) i=0;
 circles(320,y);
 delay(2000);
 cleardevice();
 if (kbhit()) break;
  }
}