PL/SQL block running without printing any output I'm trying to exexcute a pl/sql block using dbms_output to obtain a console output but without reason the unique answer by SQL developer is 'Anonymous block finished'.

declare
    v_count integer;
    lines dbms_output.chararr;
    num_lines number;
 begin
    dbms_output.ENABLE;
    num_lines := 0;

    for r in (select table_name, owner from all_tables
              where owner = 'SYSAME'
              and table_name like 'SYZ%'
              and table_name not in (select distinct table_name from all_tab_columns
                                      where OWNER = 'SYSAME'
                                      and table_name like '%SYZ%'
                                      and column_name not like '%FL_IDE_FILIALE%')) 

    loop
        execute immediate 'select count(*) from ' || r.table_name || ' where fl_ide_filiale = 12' 
            into v_count;
        dbms_output.Put_line(r.table_name ||';'|| r.owner ||';'|| v_count ||';'|| SYSDATE );    
        num_lines := num_lines + 1; 
    end loop;

    dbms_output.get_lines(lines, num_lines);
    dbms_output.Put_line(num_lines);

    FOR i IN 1..num_lines LOOP
      dbms_output.Put_line(lines(i));
    END LOOP; 

end;


Any idea why i don't obtain any output ?

Q2: is there any way to plot the output not with a string line and in a table-like way. In this case someting like a select with this values : 
r.table_name, r.owner, v_count, SYSDATE
You must run SET SERVEROUTPUT ON before you execute the PL/SQL script.