Live ORACLE

 REM set server output to ON to display output from dbms_output
SET SERVEROUTPUT ON

BEGIN
  dbms_output.Put_line('These are the tables that '
                       ||USER
                       ||' owns:');
  FOR item IN (SELECT table_name
               FROM   user_tables)
  LOOP
    dbms_output.Put_line(item.table_name);
  END LOOP;
END;
/  

These are the tables that HR owns:
EMP_AUDIT
REGIONS
LOCATIONS
DEPARTMENTS
JOBS
COUNTRIES
EMPLOYEES
JOB_HISTORY

PL/SQL procedure successfully completed.

Using PUT_LINE in the DBMS_OUTPUT Package