[PerlChina] 请教一个散列表的使用

潘建锋 panjianfeng1979 at gmail.com
Sun Aug 6 22:45:35 PDT 2006


谢谢你的指点。以后我会加上的。:-)

2006/8/7, Qiang (James) Li <shijialee at gmail.com>:
>
> On 8/4/06, 潘建锋 <panjianfeng1979 at gmail.com> wrote:
> > 好像没有用,并且我已经用了
> > use strict;
> > 还需要用
> > use warnings
> > 吗?
>
> yes. You should. and every Perl programmers should.
>
> Qiang
>
>
> > 2006/8/4, jeffhua at aol.com <jeffhua at aol.com>:
> > > When you run the script with 'use warnings' you could get the errors:
> > >
> > > Modification of a read-only value attempted
> > >
> > > $1 is a special variable in Perl,you couldn't modify it using the
> > > statement of '$1 = ...'.
> > >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: panjianfeng1979 at gmail.com
> > > To: china-pm at pm.org
> > > Sent: Fri, 4 Aug 2006 5:07 PM
> > > Subject:  [PerlChina] 请教一个散列表的使用
> > >
> > > my %levelMap = (
> > > 'PS_INDETERMINATE' => 9,
> > > 'PS_CRITICAL' => 1,
> > > 'PS_MAJOR' => 2,
> > > 'PS_MINOR' => 3,
> > > 'PS_WARNING' => 4
> > > );
> > > $1 = 'PS_MINOR';
> > > 但是下面的语句老是报错
> > > print $levelMap{$1};
> > > 提示Use of uninitialized value in print ....
> > > 请问是怎么回事?谢谢!
> > >
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