Uses CRT;

Var TB : real;

BEGIN

clrscr;

repeat

begin

write('Moi ban nhap diem trung binh: ');

Readln(TB);

end;

until (TB>0) and (TB<10);

If (TB >= 8) then write('hoc luc gioi') else

If (TB>=6.5) then write('hoc luc kha') else

If (TB>5) then write('hoc luc trung binh') else

If (TB>3.5) then write('hoc luc yeu') else

write('hoc luc kem');

Readln;

END