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Re^3: Calculate prime factors for a given numer in a perl one-liner

by Anonymous Monk
on Nov 17, 2011 at 08:25 UTC ( #938539=note: print w/replies, xml ) Need Help??


in reply to Re^2: Calculate prime factors for a given numer in a perl one-liner
in thread Calculate prime factors for a given numer in a perl one-liner

Just for info, I did the same course. Didn't googled for a solution. I've come with that solution. Now I'm googling it just to see how other perl user are solving that easy problem :-) and what I see is quite interesting (especially this things with regex!!) It might not be the speediest, but still it might be of some interest to some people!
perl -le '$_=2;while($ARGV[0]-1){if(!($ARGV[0]%$_)){print$_ ;$ARGV[0]/ +=$_;}else{$_++}}' $1
or in a non-one-liner form:
$_=2; while ($ARGV[0]-1) { if (!($ARGV[0]%$_)) { print $_ ; $ARGV[0]/=$_; } else { $_++ } }
Sincerely yours, Alessandro

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