Re: question

[Robin Sheat]

On Tue, Apr 27, 2004 at 12:12:31PM +0530, [EMAIL PROTECTED] wrote:
> can i take input to associative array from the user like this:
> %words=<stdin>;
Were it possible or not, it would be dangerous. A nice rule of 
programming to follow is that user input is evil and wrong, and must be 
checked. If someone was to supply three fields, bad things would happen. 
For example:
test.pl:
#!/usr/bin/perl
use warnings;
use strict;

my %words=<STDIN>;
foreach my $key (keys %words) {
        print "$key = $words{$key}\n";
}

$ ./test.pl
a
b
c
d  <--^D pressed after this line
a
 = b

c
 = d

(note the newlines from the input are being included, you'd probably 
need to clean it up)
The badness happens here:
$ ./test.pl
a
b
c  <--^D pressed after this line
Odd number of elements in hash assignment at ./test.pl line 5, <STDIN> 
line 3.
a
 = b

Use of uninitialized value in concatenation (.) or string at ./test.pl 
line 7, <STDIN> line 3.
c
 =


-- 
Robin <[EMAIL PROTECTED]>                 JabberID: <[EMAIL PROTECTED]>

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