SQL>
SQL> set serveroutput on
SQL> declare
2 myNumber number := 1;
3 begin
4 myNumber := 1 + 1;
5 dbms_output.put_line( '1 + 1 = ' || to_char( myNumber ) || '!' );
6 exception
7 when others then
8 dbms_output.put_line( 'We encountered an exception!' );
9 end;
10 /
1 + 1 = 2!
PL/SQL procedure successfully completed.
SQL>