How can do I run the following stored procedure in SQL/PLUS? I need to define a variable for OUT_customer_information_rec, include it in the parameter list and then print it. (I can't find the answer in Feuerstein's book )

Code:
create or replace procedure get_customer_info
 ( IN_customer_nbr               IN NUMBER, 
   OUT_customer_information_rec OUT customer_information%rowtype) 
IS
BEGIN
SELECT  * 
  INTO OUT_customer_information_rec
  FROM customer_information  
 WHERE customer_nbr = IN_customer_nbr;
END;

This does NOT work:
Code:
variable  c1  customer_inforamtion.rowtype;
exec  get_customer_info (123, :c1);
print c1;