C語言畫圖，學用circle畫圓形

程序源代碼： /*circle*/ #include "graphics.h" main() {int driver,mode,i; float j=1,k=1; driver=VGA;mode=VGAHI; initgraph(&driver,&mode,""); setbkcolor(YELLOW); for(i=0;i<=25;i++) { setcolor(8); circle(310,250,k); k=k+j; j=j+0.3; } }  *