declare
  l_name varchar2(20);
  function p_get_ename(v_empno number)
  return varchar2
  is
   v_enmae varchar2(20);
  begin
    select ename into v_ename from emp;
    return v_ename;
  end;
begin
  l_name := p_get_ename(7639);
  dbms_output.put_line(l_name);
end;