Any function to check the input value is integer?

Question

May I know if there's any function to check the input value is integer in Form 4.5?
Thanks.

Answer 1

just to add :) - (couldn't resist) :
create or replace function is_integer ( p_number in varchar2 ) return boolean is
  v_return boolean := true;
  v_number number;
begin
  v_number := p_number;
  if v_number != trunc(v_number) then
    v_return := false;
  end if;
  return v_return;
exception
  when others then
    v_return := false;
    return v_return;
end;
begin
  if not is_integer(1.1) then
    dbms_output.put_line('is not');
  end if;
  if is_integer(1) then
    dbms_output.put_line('is');
  end if;
  if not is_integer('a') then
    dbms_output.put_line('is not');
  end if;
end;