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Re^3: how to pull in all params that are numbered

by sulfericacid (Deacon)
on Jun 18, 2007 at 17:53 UTC ( #621839=note: print w/replies, xml ) Need Help??

in reply to Re^2: how to pull in all params that are numbered
in thread how to pull in all params that are numbered

Actually it didn't result in an infinite loop and I asked in the chatterbox prior to posting and two other people said that param() should stop the loop once it's iterated through with for(). I could be wrong but when I tested it, it worked and stopped once the page loaded.

"Age is nothing more than an inaccurate number bestowed upon us at birth as just another means for others to judge and classify us"

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Re^4: how to pull in all params that are numbered
by imp (Priest) on Jun 18, 2007 at 18:46 UTC
    The problem is that while does not iterate over a list, it simply checks for a true value. For example, while (1){} will run forever, whereas for (1){} will run once.

    The same behaviour occurs when test being evaluated is param(). Additionally, while (param()){} will not modify $_. Perhaps you tested the script without any arguments, in which case it would have behaved as expected.

    Here is a simple test:

    #!/usr/bin/perl use strict; use warnings; use CGI qw(param); my $runs =0; my @num; print "Content-type: text/plain\n\n"; while(param()) { printf "run %d\n", $runs++; if ($runs > 10) { print "Ran over 10 times\n"; exit; } }
    You can verify it by adding the parameters on the commandline, e.g.
    perl a=b

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[shmem]: unbelievable. ergo insurance germany offers a contract: paying 1.5 euro a day over 18 years, they ensure a payback of 7.501 euro
[shmem]: *if* there is a bonus due, they would pay 9.250
[shmem]: don't expect anything noteworthy from a countrie's elections in which such things are shrugged off.
[shmem]: otoh, hindering me from spending the money before due time is worth some fee, isn't it?

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