pl_sql_loop.sql

declare
  x number;
begin  
  for i in 0..10 loop
      dbms_output.put_line('+'||i);
  end loop;
  --------------------------
  x:=10;
  loop
    if x < 0 then
      exit;
    end if;
    dbms_output.put_line('-'||x);
    x:=x-1;
  end loop;
end;