How to get output value of stored procedure in sql plus?

Hi,guys,
How can I get the output values of a stored procedure in sql plus? I created a procedure sp1(a in char,b out char) and revoke it in sql plus as follows:
execute sp1('11',c)
How can I get the value of c?
I did as this:
declare c char(8)
execute sp1('11',c);
select c from dual;
But I always got error message: should use 'into' in select ...... Do you have some idea about that?
Thanks! Received on Mon Jan 24 2000 - 21:38:55 CST