ora-01036 非法的变量名/编号?测试不通过,该怎么解决

create or replace procedure pp(in_num number,out_num out number) astotal1 number:=0;total2 number:=0;begin  select sum(s.totalmoney)  into total1 from salerecord s where s.customerid = in_num;  select sum(s.totalmoney)  into total2 from salerecord s;  out_num := round((total1/total2*100),2);  dbms_output.put_line('地区编号为'||in_num||'的地区的销售额占总销售的百分之：'||out_num);end;

declaret_t number;begin  -- Call the procedure  pp(2,t_t);  dbms_output.put_line(t_t);end;