131.肾形图案

/* Kidney */
#include <graphics.h>
#include <math.h>
#define PI 3.1415926
void main()
{
  double a;
  int x,y,r,r1;
  int gdriver=9,gmode=2;
  initgraph(&gdriver,&gmode,"c:\\tc");
  printf("Please input Radus(<150): ");
  scanf("%d",&r);
  cleardevice();
  setbkcolor(MAGENTA);
  setcolor(WHITE);
  outtextxy(80,20,"This program show the Kidney picture.");
  for(a=0;a<=2*PI;a+=PI/27)
  {
    x=320+r*cos(a);
    y=240+r*sin(a);
    r1=abs(x-320);
    circle(x,y,r1);
  }
  outtextxy(80,460,"Press any key to quit...");
  getch();
  closegraph();
}