Simple C++ Graphics Program to Draw a Animated Circle

#include<conio.h>
#include<stdio.h>
#include<graphics.h>
#include<stdlib.h>
void main()
{int p,q,r;
int x,y;
int gdriver = DETECT, gmode;
initgraph(&gdriver, &gmode, "");

x=getmaxx()/2;
y=getmaxy()/2;
for(q=1;q<15;q++)
{
setcolor(q);
for(p=400;p>1;p--)
{
circle(x,y,p);
}
setcolor(q+2);
for(r=1;r<400;r++)
{
circle(x,y,r);
}
}
getch();
}