How to enable serveroutput in OracleXE - windows 7 os

Hi ALL
I am new to oracle. I bought Hands on Oracle database 10g express edition for windows book .
I am trying to write simple pl/sql program to display a number
when i try to execute this line DBMS_OUTPUT.PUT_LINE(SOME VARIABLE);
I am getting error
After when i refereed the book it says " you will not see the out put of a call to DBMS_OUTPUT.PUT_LINE unless you enable the
SQL*PLUS enviroment settting serveroutput with a command such as SET SERVEROUTPUT ON .
please let me know how to to navigate to SQL*PLUS enviroment settting and also to set the serveroutput on .
I am having windows 7 OS
I have installed Oracle XE in c:\ drive
Thanks
Guna

You can check to see if SERVEROUTPUT is ON for your environment by typing the following at the SQL*Plus prompt
SQL > show serveroutput
serveroutput ON SIZE 1000000 FORMAT WRAPPEDIf it's OFF like shown below:
SQL > show serveroutput
serveroutput OFFThen all you have to do to enable it is:
SQL > set serveroutput onHope this helps!

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