谢谢你的指点。以后我会加上的。:-)<br><br><div><span class="gmail_quote">2006/8/7, Qiang (James) Li <<a href="mailto:shijialee@gmail.com">shijialee@gmail.com</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On 8/4/06, 潘建锋 <<a href="mailto:panjianfeng1979@gmail.com">panjianfeng1979@gmail.com</a>> wrote:<br>> 好像没有用，并且我已经用了<br>> use strict;<br>> 还需要用<br>> use warnings<br>> 吗？<br><br>yes. You should. and every Perl programmers should.
<br><br>Qiang<br><br><br>> 2006/8/4, <a href="mailto:jeffhua@aol.com">jeffhua@aol.com</a> <<a href="mailto:jeffhua@aol.com">jeffhua@aol.com</a>>:<br>> > When you run the script with 'use warnings' you could get the errors:
<br>> ><br>> > Modification of a read-only value attempted<br>> ><br>> > $1 is a special variable in Perl,you couldn't modify it using the<br>> > statement of '$1 = ...'.<br>> ><br>> >
<br>> ><br>> ><br>> > -----Original Message-----<br>> > From: <a href="mailto:panjianfeng1979@gmail.com">panjianfeng1979@gmail.com</a><br>> > To: <a href="mailto:china-pm@pm.org">china-pm@pm.org
</a><br>> > Sent: Fri, 4 Aug 2006 5:07 PM<br>> > Subject: [PerlChina] 请教一个散列表的使用<br>> ><br>> > my %levelMap = (<br>> > 'PS_INDETERMINATE' => 9,<br>> > 'PS_CRITICAL' => 1,<br>> > 'PS_MAJOR' => 2,
<br>> > 'PS_MINOR' => 3,<br>> > 'PS_WARNING' => 4<br>> > );<br>> > $1 = 'PS_MINOR';<br>> > 但是下面的语句老是报错<br>> > print $levelMap{$1};<br>> > 提示Use of uninitialized value in print ....
<br>> > 请问是怎么回事?谢谢!<br>> ><br>> > _______________________________________________<br>> > China-pm mailing list<br>> > <a href="mailto:China-pm@pm.org">China-pm@pm.org</a><br>> > <a href="http://mail.pm.org/mailman/listinfo/china-pm">
http://mail.pm.org/mailman/listinfo/china-pm</a><br>> ><br>> ><br>> ________________________________________________________________________<br>> > Check out AOL.com today. Breaking news, video search, pictures, email
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