[PerlChina] 请教一个散列表的使用

[潘建锋]

好像没有用，并且我已经用了
use strict;
还需要用
use warnings
吗？

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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