There is too little context in your code sample, for example you don't show how $arrLenA and $arrLenB are initialised. Beyond this, I strongly suspect you're not running under strict and warnings, that are likely to hint you that there's something wrong with your code. As an example, $sentencesA[$z] tells us that there should be an @sentencesA array, but $setencesB{$i} shows two things:

• you are probably mispelling your variable name (maybe you wanted to write sentencesB?)
• you're not using an array, but hash %setencesB

Please clean up your code, and bake a self-contained example that's easy for us to cut-and-paste into a file to see what's wrong. Strive to make it as little as possible, but working. Be sure to put

use strict;
use warnings;
[download]

at the beginning. You'll probably see that when you've got the example ready without receiving any compilation error or warning, your code will probably work ;-).

On a more general ground, there are other things to note:

• you correctly start iterating from index 0, but then you should probably set your continuation condition to $z < $arrLenA instead of <=
• if both array contain the string 'hello' repeated 10 times, the result will be 10 * 10 = 100 matches, because you're comparing each element in A to each element in B. Is this what you really want?

Hope this helps!

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