Well i found something weird:
anarion@foo:~$ perl -le 'sub a{my$c=pop;print $c;$c*a($c-1)unless!$c}p
+rint a(--$ARGV[0])' 5
4
3
2
1
0
24
anarion@foo:~$ perl -le 'sub a{my$c=pop;print $c;$c*a($c-1)if$c}print 
+a(--$ARGV[0])' 5
4
3
2
1
0
0

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jeffa has tried and have weird results printing 120 too, its a bug or i'm missing something?
I have perl 5.6.1 in a linux.

$anarion=\$anarion;

s==q^QBY_^=,$_^=$x7,print

In reply to isn't unless ! $c the same than if $c ? by Anarion

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