Re^2: A way to avoid repeated conditional loops

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Re^3: A way to avoid repeated conditional loops by SuicideJunkie (Vicar) on Aug 24, 2011 at 13:57 UTC
Are you assuming that 'alpha' is also always the first line in the file? Also, the posted flipflop doesn't behave the same as the OP A simpler way to just use a flag and short circuit the regex work: `my $seen = 0; while (<$fh>) { if ( !$seen and m/^alpha$/) { $seen = 'yes indeed'; print "true\n"; }else{ print "false\n"; } }` [download] Given a test file of: `foo bar alpha beta gamma delta` [download] The results I got are: `Original: false false true false false false Flipflop: Argument "" isn't numeric in numeric gt (>) at test.pl line 21, <$fh> +line 1. false Argument "" isn't numeric in numeric gt (>) at test.pl line 21, <$fh> +line 2. false false true true true Flag: false false true false false false` [download]	[reply] [d/l] [select]
Re^4: A way to avoid repeated conditional loops by tinita (Parson) on Aug 24, 2011 at 15:10 UTC
hm, if I add `no warnings "numeric";` to the flip-flop code, the output seems to be fine. output all lines after "alpha". at least that's how I understood the task.	[reply] [d/l]
Re^5: A way to avoid repeated conditional loops by Anonymous Monk on Aug 24, 2011 at 16:27 UTC
The OP code has an else condition on the match for alpha. That should execute for every line of the file except the 'alpha', regardless of before or after.	[reply]
Re^4: A way to avoid repeated conditional loops by Deus Ex (Scribe) on Aug 24, 2011 at 14:43 UTC
No, "alpha" might be anywhere in the middle of the file (but it will appear only once). Actually the flip-flop operator may work only after "alpha" matched. Many thanks though for the short-circuiting thing :)	[reply]