Observe magic for the perl puzzle of the day, based on the math puzzle:
#!/usr/bin/perl -w
use strict;
# my $a = 0; ## notice this is deleted!
$a += $_ for 1..1000;
print "Answer: $a\n";
Points to ponder:
- Why does this even compile? It's use strict!
- Why no warnings? We're using undef in math!
- How come it still gets the same result? We didn't initialize the variable!
- Bonus question: can you tell why we removed all uses of $a as
a casual variable from the third edition
of Learning Perl?
Hmm. {grin}
-- Randal L. Schwartz, Perl hacker
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