How to assign store proc parameter to other parameter memebers?

Question

i really do not want to decalare t_param2 and check if default value is null of param2 then assign param1 to it. Any way i can achieve the following without declaring temp variables.?????
create or replace procedure Proc1( param1 varchar2, param2 varchar2 := param1)
IS
BEGIN
null;
END;
show errors
1/54 PLS-00227: subprogram 'in' formal PARAM1 is not yet denotable
0/0 PL/SQL: Compilation unit analysis terminated

Answer 1

I think this is one of the solution...
CREATE OR REPLACE PROCEDURE proc1 (param1 VARCHAR2, param2 VARCHAR2)
IS
---p2 VARCHAR2(100);
procedure p1(param1 varchar2, param2 varchar2)
IS
BEGIN
DBMS_OUTPUT.PUT_LINE('param1-->'||param1||' param2 -->'||param2);
END;
BEGIN
p1(param1,nvl(param2,param1));
dbms_output.put_line(param1||':'||param2);
END proc1;
show errors;
set serveroutput on
exec proc1('A', 'B');
set serveroutput on
exec proc1('A', null);