Printing Numbers ascending

--first function
--argument is 2 integers
--prints integers from lowest to highest

create or replace function printnumber(l int, h int)
    returns void as $$
declare
    i int;   
begin
       << outer_loop >>
       FOR i IN l..h LOOP
        raise notice '%', i;     
       END loop outer_loop;   
end $$language plpgsql;