Color changing ring

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

#include <dos.h>

int main(void)

{

   /* request auto detection */

   int gdriver = DETECT, gmode, errorcode;

   int midx, midy;

   int i;

   int stangle = 0, endangle = 360;

   int xradius = 100, yradius = 50;

   /* initialize graphics, local variables */

   initgraph(&gdriver, &gmode, "");

   /* read result of initialization */

   errorcode = graphresult();

   if (errorcode != grOk)

   /* an error occurred */

   {

      printf("Graphics error: %s\n", grapherrormsg(errorcode));

      printf("Press any key to halt:");

      getch();

      exit(1);

   /* terminate with an error code */

   }

   for(i=2;i<20;i++)

   {

   midx = 1000 / i;

   midy = 1000 / i;

   setcolor(i);

   /* draw ellipse */

   ellipse(midx, midy, stangle, endangle,

  xradius, yradius);

  delay(250);

  }

    /***************************************/

    for(i=20;i>2;i--)

    {

    midy = 1000 / i;

   midx = 1000 / i;

   setcolor(14);

   ellipse(midx, midy, stangle, endangle,

  xradius, yradius);

  delay(500);

   }

   setcolor(getmaxcolor());

   /* draw ellipse */

   ellipse(midx, midy, stangle, endangle,

  xradius, yradius);

   /***************************************/

   /* clean up */

   getch();

   closegraph();

   return 0;

}