dictionary using perl 
March 25th, 2008, 11:10 PM
| | Newbie | | Join Date: Nov 2007
Posts: 9
| |  dictionary using perl
i am trying to write a dictionary using perl, the program would use a primary .pl file, and a text file, designated .dat
i have no programing background, and am trying to teach myself perl, and c++, so excuse my ignorance.
i have experimented with some scripts, i have figured out why my last one didn't work, but i have no idea what to do. this was my last attempt:
dictionary.pl -
#!/usr/bin/perl
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$data_file="bionicle.dat";
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$input=<STDIN>;
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open(DAT, $data_file) || die("Could not open file!");
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@raw_data=<DAT>;
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close(DAT);
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foreach $word (@raw_data)
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{
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chop($word);
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($name,$def)=split(/\|/,$word);
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if ($name=$input) {
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print "$name: $def";
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sleep(10);
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} else {
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print "sorry, word not found";
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sleep(3);
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}
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}
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and dictionary.dat -
word1|definition1
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word2|definition2
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word3|definition3
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so i that my script was nothing like what i wanted, but what did i want?
thanks in advance,
ian
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March 26th, 2008, 12:11 AM
|  | Expert | | Join Date: Jan 2007 Location: Southern California USA
Posts: 4,031
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beginner mistake:
'=' is the assignment operator so the above is always true because you are assigning the value of $input to $name. Probably you want to use 'eq':
look up perls string operators when you get a chance.
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March 26th, 2008, 12:30 AM
| | Newbie | | Join Date: Nov 2007
Posts: 9
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Quote: |
Originally Posted by KevinADC beginner mistake:
'=' is the assignment operator so the above is always true because you are assigning the value of $input to $name. Probably you want to use 'eq':
look up perls string operators when you get a chance. | oops actually i think i meant to use "==", i knew that. isn't "eq" used for numeric equallity?
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March 26th, 2008, 12:47 AM
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Posts: 9
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by the way, my intended result was for the script to print the word originally typed, and the definition supplied by the dictionary.dat file. actually there were quite a few problems with that script.
basically my question is how can i make perl read from another file, such as the one i supplied, search for a word found before the pipe divider, and print the text following the pipe.
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March 26th, 2008, 12:56 AM
|  | Moderator | | Join Date: Jul 2007 Location: Arkansas
Posts: 898
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March 26th, 2008, 01:05 AM
| | Newbie | | Join Date: Nov 2007
Posts: 9
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ok thanks, i guess i shouldn't question people more experienced than me lol. i got that completely backward.
however upon using the "eq" operator, my script just ran indefinitely, without ever printing an indication of true or false. i believe if it was working correctly, although this is not what i wanted, wouldn't it print "word not found", for each line in the dictionary.dat file? but when i run it, it never prints anything.
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March 26th, 2008, 04:58 PM
| | Expert | | Join Date: Jan 2007 Location: Southern California USA
Posts: 4,031
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Quote: |
Originally Posted by islayer ok thanks, i guess i shouldn't question people more experienced than me lol. i got that completely backward.
however upon using the "eq" operator, my script just ran indefinitely, without ever printing an indication of true or false. i believe if it was working correctly, although this is not what i wanted, wouldn't it print "word not found", for each line in the dictionary.dat file? but when i run it, it never prints anything. | post a few (2 or 3) sample lines from the dictionary file and show what input you give your script.
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March 27th, 2008, 12:00 AM
| | Newbie | | Join Date: Nov 2007
Posts: 9
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Quote: |
Originally Posted by KevinADC post a few (2 or 3) sample lines from the dictionary file and show what input you give your script. | the dictionary is a dictionary of maori words.
dictionary.dat: -
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kopaka|ice
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pohatu|stone
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tahu|burn
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this is just an example there are a lot of words before, after, and in between.
input into dictionary.pl:
"tahu" without quotes
it then runs infinitely without printing, and obviously not ending.
(edit) actually after some time it does end. so i guess it is going through my entire dictionary.dat file.
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March 27th, 2008, 02:57 AM
| | Moderator | | Join Date: Jul 2007 Location: Arkansas
Posts: 898
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After you get your input into the $input variable use chomp. - my $file_name = 'f:/test_file.txt';
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print 'Please enter a word?';
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my $input = <STDIN>;
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chomp($input);
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open (my $FILE, '<', $file_name) || die "Can't open file $file_name: $!\n";
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while (<$FILE>) {
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chomp;
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my ($name, $def) = split(/\|/);
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if ($name eq $input) {
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print "$name means $def\n";
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exit;
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..rest of code here...
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}
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close($FILE);
--Kevin
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March 27th, 2008, 04:39 AM
| | Newbie | | Join Date: Nov 2007
Posts: 9
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Quote: |
Originally Posted by eWish After you get your input into the $input variable use chomp. - my $file_name = 'f:/test_file.txt';
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print 'Please enter a word?';
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my $input = <STDIN>;
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chomp($input);
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open (my $FILE, '<', $file_name) || die "Can't open file $file_name: $!\n";
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while (<$FILE>) {
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chomp;
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my ($name, $def) = split(/\|/);
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if ($name eq $input) {
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print "$name means $def\n";
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exit;
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..rest of code here...
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}
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close($FILE);
--Kevin | ok, thank you very much! most of the code make sense to me, but like i said, im a n00b. the parts i don't understand are '<' and < and > around $FILE
thanks a lot,
ian
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March 28th, 2008, 01:59 AM
| | Moderator | | Join Date: Jul 2007 Location: Arkansas
Posts: 898
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It is the same as witting the following. - open FILEHANDLE,MODE,EXPR
In theory it is a more secure way to open a file. That is according to ' Perl Best Practices'.
--Kevin
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