肾形图案

#include <graphics.h>
#include <math.h>
#define PI 3.1415926
main()
{
  int x,y,r,rl;
  double a;
  int gdrive=9,gmode=2;
  initgraph(&gdrive,&gmode,"C:\\tc");
  printf("Input Radus(<150)\n");
  scanf("%d",&r);
  cleardevice();
  setbkcolor(MAGENTA);  setcolor(WHITE);
  for (a=0; a<2*PI; a+=PI /27)
  {
    x=r*cos(a)+320;  y=r*sin(a)+240;
    rl=abs(x-320);  circle(x,y,rl);
  }
  getch();
  closegraph();
}