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Re: $#="%c"; possible bug

by ambrus (Abbot)
on Feb 21, 2004 at 18:20 UTC ( #330838=note: print w/replies, xml ) Need Help??


in reply to $#="%c"; possible bug

After abigail's post, it's clear how $# works. Perl calls the builtin sprintf with a single floating point argument, and the resulting text is the string representation of the number (if $# is set). You can even decompose a double to two ints by setting $# to "%x/%x". This explains the strange strange phenomena that setting $# to a stupid value causes.

However, as an interesting consequence you can still segfault perl with some code like perl -we '$#="%s\n"; print exp 1;' or perl -we '$#="%n\n"; print exp 1;'

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Re^2: $#="%c"; possible bug
by ambrus (Abbot) on Jul 20, 2004 at 00:24 UTC

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[Discipulus]: Corion are you would able to realize such thing? O_O
[Corion]: In the same vein I have a script that automates Firefox to enter some data into another system. It's not faster than the people using the script if they were to do it manually, but they prefer not having to check the data and not having typos when ...
[Corion]: ... entering the data
[Corion]: Discipulus: I don't know whether I could really do that, but the init process itself mostly launches other processes, and the whole startup is just following a path of dependencies and making sure they are all running. Which basically is what ...
[Discipulus]: when at work my time is (temporarly) owned by the firm, so i do not care (coworkers whatch movies.. I code Perl)
[Corion]: ... make already does, except for files instead of programs. But maybe with some /proc hackery, that could be eliminated and one could use plain make :-D
[choroba]: systemd just makes is asynchronous
[choroba]: so, make -j
[Corion]: Discipulus: Yeah - but when writing Perl to save time (instead of having fun), it helps to look whether you're actually saving time ;) Why spend 5 minutes doing manually what you can spend three years automating? ;)
[Corion]: choroba: Oh, yeah :-D

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