PL/SQL problem

This is probably a stupid question but Ive been trying all kinds of ways to get information OUT of a PL/SQL block without writing it to a table. I'm hoping that someone out there has tried the same thing and can tell me (A) how to do it, or (B) it cant be done....  

My latest attempt under sqlplus goes something like...  

SQL> define MYVAR=500
SQL> declare
2 i number ;
3 begin
4 for i in 1..10 loop
5 MYVAR := &MYVAR + i ;
6 end loop ;
7 end ;  

A pathetic attempt, but you can see what Im trying to acheive (I hope).  

Any ideas?  

-- 
Paul Snelling,	BoxField Systems Ltd