画椭圆ellipse（在TC中实现）。
程序分析：无。
程序源代码：
include "stdio.h"
include "graphics.h"
include "conio.h"
int main()
{
int x=360,y=160,driver=VGA,mode=VGAHI;
int num=20,i;
int top,bottom;
initgraph(&driver,&mode,"");
top=y-30;
bottom=y-30;
for(i=0;i<num;i++)
{
ellipse(250,250,0,360,top,bottom);
top-=5;
bottom+=5;
}
getch();
}
