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Joined: Sep 2002
Posts: 5
Junior Member
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Junior Member
Joined: Sep 2002
Posts: 5 |
hi guys i bought a text to teach myself the basics of perl.. .and so far i understand everything except i decided just for fun to type out one of the beginning sample programs directly from the text.. and well, it doesn't work the sample is this:
#!/usr/bin/perl
@array = ( "Hello", 283, "there", 16.439 );
$i = 0;
while ( $i < 4 ) {
print "$i $array[ $i ]n";
++$i;
} do any of you programmers out there see anything wrong with it? my server is set up fine and programs like UBB run perfect on it so it's not a problem with my setup or whatever.. and i chmodded 755... i just can't see why it's returning a 500 internal server error needless to say this is discouraging since this is a very basic example and it's not working
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Joined: Mar 2001
Posts: 7,394
Admin / Code Breaker
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Admin / Code Breaker
Joined: Mar 2001
Posts: 7,394 |
It's fine (I even tested it). Just don't forget this code is for command-line perl, not on your server. If you want your site to work with it, don't forget to print content-type: text/plain.
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Joined: Sep 2002
Posts: 5
Junior Member
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Junior Member
Joined: Sep 2002
Posts: 5 |
thanks a lot i guess i didn't get to the part yet that explains the difference between command-line perl and the type for my server... i thought the perl interpreter on my server would be able to read this basic thing and print the results onto the screen *trying not to get overwhelmed already* 
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Joined: Aug 2000
Posts: 874
Moderator / Developer
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Moderator / Developer
Joined: Aug 2000
Posts: 874 |
code:
That's probably giving the error, should be; code:
[qb][/qb] Though I could be wrong and it could be valid.
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Joined: Mar 2001
Posts: 7,394
Admin / Code Breaker
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Admin / Code Breaker
Joined: Mar 2001
Posts: 7,394 |
jordo, I tried it in my computer and it works with ++$i 
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Joined: Mar 2001
Posts: 7,394
Admin / Code Breaker
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Admin / Code Breaker
Joined: Mar 2001
Posts: 7,394 |
Oh, I have just noticed it's in Chit Chat, moving to serversidescripting 
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Joined: May 2000
Posts: 1,356
Addict
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Addict
Joined: May 2000
Posts: 1,356 |
quote:
Originally posted by Poe Reader: thanks a lot
i guess i didn't get to the part yet that explains the difference between command-line perl and the type for my server... i thought the perl interpreter on my server would be able to read this basic thing and print the results onto the screen
*trying not to get overwhelmed already*
When the server runs it and submits data to your browser, you have to specify what type of content is. Is the data a text file? Is the data a html file? Is the data an image file?? You say 'this is a text file' first and then send the contents of this text file... This 'Content-Type' is an "HTTP HEADER" field: code:
[qb]#!/usr/bin/perl
@array = ( "Hello", 283, "there", 16.439 );
$i = 0;
print "Content-Type: text/plainnn";
while ( $i < 4 ) {
print "$i $array[ $i ]n";
++$i;
} you must send header messages before the content...
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Joined: Aug 2000
Posts: 335
Member
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Member
Joined: Aug 2000
Posts: 335 |
As a general rule, the preincrement operator (++$i) is more efficient than the postincrement ($i++) operator.
The reason is that when the postincrement operator is used in an expression, it involves saving a temporary value.
In this case, it doesn't really matter, since $i is a simple variable and it's not part of a larger expression.
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Joined: Sep 2002
Posts: 5
Junior Member
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Junior Member
Joined: Sep 2002
Posts: 5 |
thanks tons! when i added the print content type part, it worked on my server just fine! yay!
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