declare 
errbuf varchar2(20) default '0' ;
retcode varchar2(30) default 'JUST A TEST' ;

begin
dbms_output.put_line(retcode||'1111'); 
end;

------解决方案--------------------
SQL code


SQL> create or replace package XXAE03103
  2  is
  3   procedure main(errbuf in VARCHAR2 ,retcode OUT VARCHAR2);
  4  end XXAE03103;
  5  /

Package created

SQL> CREATE OR REPLACE PACKAGE BODY XXAE03103
  2  IS
  3    PROCEDURE main(errbuf in VARCHAR2 ,retcode OUT VARCHAR2)
  4    IS
  5    BEGIN
  6      retcode := errbuf||'testing.....';
  7    END main;
  8  END XXAE03103;
  9  /

Package body created

SQL> DECLARE
  2      WREN4255    VARCHAR(20);
  3      WREN42554255 VARCHAR(30);
  4  
  5  BEGIN
  6      WREN42554255 := '00000';
  7      XXAE03103.main(WREN42554255,WREN4255);
  8      dbms_output.put_line(WREN4255);
  9  END;
 10  /

00000testing.....

PL/SQL procedure successfully completed

------解决方案--------------------
楼猪是输入的参数
在proc中  in 也可，in out也可