程序代码：

#include <graphics.h>
void main()
{
   int graphdriver = VGA;
   int graphmode = VGAHI;
   initgraph(&graphdriver,&graphmode,"");
   cleardevice();
   setcolor(3);
   setfillstyle(3,2);
   rectangle(50,50,100,100);
   getch();
   closegraph();
}