Drop table/view

[Quoted] [Quoted] I'm trying to write a PL/SQL procedure to drop tables/views. The purpose is to drop
[Quoted] only when the object exists. I've already written a PL/SQL block to check if the object
exists, but when it exists and I tell it to drop the object it gives the next PL/SQL error message:
PLS-00103 Encountered the symbol "DROP" when expecting one of the following:
begin declare end exception exit for goto if loop mod null pragma raise return select update while <an identifier> etc. The code I have so far :

set serveroutput on
set feedback off
set verify off

--
define obj_name='&1'
begin
        declare
                name    all_objects.object_name%type;
                obj     all_objects.object_type%type;
        begin
                select  object_name
                ,       object_type
                into    name
                ,       obj
                from    all_objects
                where   object_name = upper ('&obj_name')
                and     object_type != 'SYNONYM';
                dbms_output.put_line ('existing');


                /* Here I want to drop the object */


                /* like : drop obj name;        */


        exception
                when no_data_found then
                        dbms_output.put_line ('non existing');
        end;
end;
/

Who can and is willing to help me?

Guido vd Zweerde
Universiteit Twente