#include <cstdlib>
#include <iostream>
#include <winbgim.h>

using namespace std;

int main()
{
    int gdriver=9;
    int gmod=2;
    initgraph(&gdriver, &gmod, "");
    setbkcolor(WHITE);
    setcolor(BLACK);
    cleardevice();
    circle(320, 240, 180);
    getch();
    closegraph();
    return 0;
}