Re^2: my Scope Pop Quiz

$rv is clearly undefined. An undefined value is represented by an empty string when printed (whether it is in an interpolated string or not).

#!/usr/bin/perl
use strict;
my $rv = 42 for (1);
print "rv unquoted: '", $rv, "'\n";
print "rv quoted: '$rv'\n";
[download]

Comment on Re^2: my Scope Pop Quiz Download Code

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Re^3: my Scope Pop Quiz by ikegami (Patriarch) on Apr 09, 2005 at 05:13 UTC
An undefined value is represented by an empty string when printed yes, but an undefined value should also print a warning under -w when one attempts to print it, and I'm not getting any warnings when I specify -w. Very odd.	[reply]
Re^4: my Scope Pop Quiz by Tanktalus (Canon) on Apr 09, 2005 at 14:12 UTC
`$ perl -we 'use strict; my $rv = 42 for (1); print $rv,$/' Use of uninitialized value in print at -e line 1.` [download] Seems to be printing a warning for me. The original code didn't include "use warnings" in it, so I added some and the warning expected did appear.	[reply] [d/l]
Re^5: my Scope Pop Quiz by ikegami (Patriarch) on Apr 09, 2005 at 14:26 UTC
Not on my ActivePerl v5.6.1. Is that what you're using? I tried both `use warnings;` and `-w`, like I said in the first post. Very odd, eh?	[reply] [d/l] [select]