Re^2: Perl code to format the text file by inserting tag in blank line

I think the OP is probably ok here.
He is using arrays in a "non-Perl" way and with explicit indices starting at 1 instead of 0. Not using array[0] is allowed. $kpi[0] is probably undef.

"Off by one" is one of the most common errors in programming. I personally would rewrite the code so that it doesn't use indices at all like: foreach my $element (@array){} However a re-write like appears to be outside the scope of the question before us. Perl code like that would use index 0. However there would not be any direct reference to that zero index within the code at all. Creating the kpi array would use "push" instead of explicit indices from 1..n. If the OP creates the kpi array with starting with $kpi[1] that just makes index 0 undef (skips it). I don't see any indication that the OP is aware of: push,pop,shift,unshift.

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Re^3: Perl code to format the text file by inserting tag in blank line by AnomalousMonk (Archbishop) on Feb 13, 2020 at 06:00 UTC
I think the OP is probably ok here. I'm not so sure. DAN0207 is a self-described Perl "beginner", and looking at other posts by this monk doesn't give me the sense that he or she is necessarily aware of the issue of 0- versus 1-based arrays. We also cannot see anything about how the `@kpi` array is initialized. The whole thing made my buggy-sense tingle. However, DAN0207 hasn't seen the need to follow up on the point I made here (indeed, replying with a question on a completely different topic), so I guess everything's ok... Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]
Re^4: Perl code to format the text file by inserting tag in blank line by Marshall (Canon) on Feb 13, 2020 at 06:33 UTC
Well to completely digest the collective advice given so far would take days, not hours for a beginner. At this point, I figure the OP has learned some bits of what was presented, but not everything presented. If the OP has no further questions at this time, I'm ok with that.	[reply]