pascal200309201什么意思？

{$N+,$E+}

program fracdec;

var n,m:extended;u:string;i,j,k,l:longint;

begin

assign(input,'fracdec.in');

assign(output,'fracdec.out');

reset(input);

rewrite(output);

read(n,m);n:=n/m;

str(n,u);

k:=pos('.',u);

l:=1;

repeat

for j:=k+1 to length(u)-1 do

for i:=j+1 to length(u) do

if copy(u,j,l)<>copy(u,i,l) then l:=l+1 else begin insert('(',u,l);insert(')',u,length(u)+2);

write(u);close(input);close(output);halt;end;

until l>length(u)-k;

write(u);

close(input);

close(output);

end.

这个程序的问题在哪？