how to change expired status of user accounts.txt

SQL> select username,account_status from dba_users where username='DIP';

USERNAME ACCOUNT_STATUS
----------------------- ---------------
SCOTT EXPIRED & LOCKED


SQL> alter user SCOTT account unlock;

User altered.

SQL> select username,account_status from dba_users where username='SCOTT';

USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
SCOTT EXPIRED

SQL> select password from dba_users where username='SCOTT';

PASSWORD
------------------------------
CE4A36B8E06CA59C

SQL> alter user scott identified by values 'CE4A36B8E06CA59C';

User altered.

SQL> select username,account_status from dba_users where username='SCOTT';

USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
SCOTT OPEN