#include <graphics.h>
int main()
{
    int gd = 0, gm = 9;
    initgraph(&gd, &gm, NULL);
    arc(100, 100, 0, 360, 50);
    delay(2000);
    return 0;
}

codeaft@codeaft:~$ g++ codeaft.cpp -lgraph
codeaft@codeaft:~$ ./a.out