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Re: Can you guess what this code does?
by japh (Friar) on Apr 17, 2002 at 23:45 UTC
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It evaluates an empty match and tries to divide it by bareword 'g', resulting in division by zero. | [reply] |
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I guess I won't post an node to get a Illegal division by zero golf challenge without numbers, since we have a winner, unless you want to try to golf this more. (Similar to (Golf) Segfault Perl).
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I guess I won't post an node to get a Illegal division by zero golf challenge without numbers, since we have a winner, unless you want to try to golf this more.
a/b
3 characters.
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[d/l] |
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Well, not when I run that code. The code you ran probably has 6 characters. The code I run has 8. Hint: my code is a substitution -- that means one of the characters you "can't see" is an "s".
_____________________________________________________
Jeff[japhy]Pinyan:
Perl,
regex,
and perl
hacker, who'd like a (from-home) job
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;
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There are 24 characters in my answer.
- tye (but my friends call me "Tye")
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$ wget -qO japhy.pl "http://perlmonks.org/index.pl?node_id=160033&displaytype=displaycode"
$ cat japhy.pl
//
/g;
$ wc japhy.pl
4 2 10 japhy.pl
$ perl -nle 'print join " ", map {ord} split//' japhy.pl
47 47 13
47 103 59
$ perl japhy.pl
Illegal division by zero at japhy.pl line 1.
$ perl -v
This is perl, v5.6.1 built for i386-linux
4 lines, 2 words, 10 characters - six ord'd plus 4 newlines.
There's a DOS-style \r on line 1 but I don't have a cygwin box handy to see if behavior is different in Windows.
Another hint?
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Re: Can you guess what this code does?
by graff (Chancellor) on Apr 18, 2002 at 07:57 UTC
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My Theory: The difficulty (challenge) of this problem is that
japhy was unable to convey all 8 characters of the code into
the posting (at least, not without giving it away); if
rendered explicitly (requiring more than 8 characters), it
would look like this:
s/\x08/\n/g;
which has the effect of replacing all ASCII 008 bytes
(back-space characters) with newlines.
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[d/l] |
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The correct explicit form is:
s/\r/\n/g;
This can be rendered in emacs using "^Q^M" in place of "\r"
and "^Q^J" in place of "\n" (or just the "return" key"). | [reply]
[d/l] |
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Bravo. :) Funny about the backspace thing... when I asked the question on #perl, converter answered the same way, and then corrected himself.
_____________________________________________________
Jeff[japhy]Pinyan:
Perl,
regex,
and perl
hacker, who'd like a (from-home) job
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;
| [reply]
[d/l] |
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NO! It's more subtle than that -- my version would have
shown the initial "s", which is supposed to be hidden.
Sorry... Back to the drawing board.
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Re: Can you guess what this code does?
by tachyon (Chancellor) on Apr 18, 2002 at 07:03 UTC
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/ / / / /
tachyon
s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print
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[d/l] |