the question of mysql, help!!!

ttlyz

when I install mysql 4.0. jt appears as below:

[root@ttlyz bin]# ./mysqld_safe user=root &
[1] 1021
[root@ttlyz bin]# Starting mysqld daemon with databases from /var/lib/mysql
[root@ttlyz bin]# ./mysql
ERROR 1045: Access denied for user: 'root@localhost' (Using password: NO)

who can tell me what's the problem and how to solve it ?
thanks!

dsj

你先su -   再安装试试

wind521

./mysql -p
然后输入口令才成