varalaxmibbnl:

When you have a problem like this, you should add some print statements to show your variables, so you can verify that they hold what you're expecting. In this case, try adding $. to your existing print statement, like this:

print "$., $line"

[download]

When you do so, your output is:

10
15: 1
15: hw
15: r
15: u
15: hi
15: 2
15: hw
15: r
15: u
15: hi
15: 3
15: hw
15: r
15: u

[download]

So you can see that the line number is 15 for every iteration through your for loop. Why is that? It turns out that when you use foreach it wants a list in the parenthesis, so it reads the entire file at once. It then gives you one line at a time.

Generally when processing a file and want to do it one line at a time, we do it like:

while (my $line = <MYFILE>) {
   ... code in loop ...
}

[download]

There are some other issues in your code, but I'll let your instructor clarify that.

...roboticus

When your only tool is a hammer, all problems look like your thumb.

In reply to Re^3: difference between two files by roboticus
in thread difference between two files by varalaxmibbnl

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