dictionary using perl | Newbie | | Join Date: Nov 2007
Posts: 9
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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
|  | Expert | | Join Date: Jan 2007 Location: Southern California USA
Posts: 4,091
| | | re: dictionary using perl
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.
| | Newbie | | Join Date: Nov 2007
Posts: 9
| | | re: dictionary using perl
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?
| | Newbie | | Join Date: Nov 2007
Posts: 9
| | | re: dictionary using perl
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.
|  | Moderator | | Join Date: Jul 2007 Location: Arkansas
Posts: 900
| | | re: dictionary using perl
| | Newbie | | Join Date: Nov 2007
Posts: 9
| | | re: dictionary using perl
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.
| | Expert | | Join Date: Jan 2007 Location: Southern California USA
Posts: 4,091
| | | re: dictionary using perl
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.
| | Newbie | | Join Date: Nov 2007
Posts: 9
| | | re: dictionary using perl
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.
| | Moderator | | Join Date: Jul 2007 Location: Arkansas
Posts: 900
| | | re: dictionary using perl
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
| | Newbie | | Join Date: Nov 2007
Posts: 9
| | | re: dictionary using perl
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
| | Moderator | | Join Date: Jul 2007 Location: Arkansas
Posts: 900
| | | re: dictionary using perl
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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