Frequency Counter
just started to go through perl tutorial, and can’t figure out the solution for this problem, help! Tnks?
A word frequency counter. How often does each word show up in an array of words? Print out a report. (Hint: Use a hash to count of the number of appearances of each word.)
hi tru_story, thanks for the answer. I thought about your solution. However, what I’m trying to figure out is the harsh solution which hined by the tutorial .( See the link, at the “play around” section. )http://www.perl.com/pub/a/2000/10/begperl1.html
Very simple using hash:
@words = (”hello” , “weary” , “dreary” , “weary”);
%num = ();
foreach $word(@words) {
$num{$word} ++;
}
foreach $key(keys %num) {
print”$key appears $num{$key} timesn”;
}
Explanation:
%num is a hash which maps a word to the number of times it appears in the array.
The number of occurrences is calculated by scanning the array and then incrementing the number mapped to the word.
$num {$word} = 0 by default and since there can only be one mapping per word we get a unique number per word.
The final loop goes through each key of the hash which we have defined as unique words in the array and printing out the number assigned to it.
More detail:
foreach $word(@words) {
$num{$word} ++;
}
First iteration sets $num{’hello’} = 0++ = 1;
Then $num{’weary’} = 1 and then $num{’dreary’} = 1;
Now we find the second instance of weary.
Since we have already defined a hash map of the word weary,
$num{’weary’} ++ = 1 + 1 =2 giving correct number of instances of weary.
foreach $key(keys %num) {
print”$key appears $num{$key} timesn”;
}
This loops through each key of %num. We have defined each key as a unique word so $num($key) gives the number mapped to the word which is what we want.
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