Draw Circle Inside Circle

/*
Write a program in C for Drawing circles inside circles using graphics functions
*/
 
#include<graphics.h>
#include<conio.h>
#include<dos.h>

main()
{
int gd = DETECT, gm, x, y, color, angle = 0;
 
struct arccoordstype a, b;

initgraph(&gd, &gm, "C:\\TC\\BGI");
 
delay(2000);

while(angle<=360)
{
 
setcolor(BLACK);
 
arc(getmaxx()/2,getmaxy()/2,angle,angle+2,100);
 
setcolor(RED);
 
getarccoords(&a);
 
circle(a.xstart,a.ystart,25);
 
setcolor(BLACK);
 
arc(getmaxx()/2,getmaxy()/2,angle,angle+2,150);
 
getarccoords(&a);
 
setcolor(GREEN);
 
circle(a.xstart,a.ystart,25);
 
angle = angle+5;
 
delay(50);
}

getch();
 
closegraph();
 
return 0;
}