Draw Circle circle with center of screen using C and C++

#include<stdio.h>
#include<graphics.h>
#include<conio.h>

int main()
{
   int gd = DETECT,gm;
   int x ,y;
   initgraph(&gd, &gm, "");
   /* Initialize center of circle with center of screen */
   x = getmaxx()/2;
   y = getmaxy()/2;

   outtextxy(240, 50, "Concentric Circles");
   /* Draw circles on screen */
 
   circle(x, y, 30);
 
   getch();
   closegraph();
   return 0;
}