> it has problem with end of file .
> so use this pattern an Accept your code :D
> 
> while(scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&arr[0].x,&arr[0].y,&arr[1].x,&arr[1].y,&arr[2].x,&arr[2].y,&arr[3].x,&arr[3].y)!=EOF)
> {
> .
> .
> .
> }
对对对！
我用的pascal
while not eof do begin
 read(p[1].x）； if eof then break;
 read(p[1].y）；
 for i:=2 to 4 do read（p[i].x,p[i].y);
.........

谁最阴险？？？？北大就是！