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The main problem of your code has been solved. However, there are lots of other things that can be improved:
  • Use the 3 argument version of open with lexical filehandles. Also, the open or die idiom is much more readable and common than your unless structure.
  • Do not use the same name for various types of things (scalar and array variable in this case).
  • If you can process the file line by line, do not slurp it all into memory.
  • Use hashes to count numbers of occurrences.
Here is how I would approach your problem:
#!/usr/bin/perl use strict; use warnings; print "Enter the file containing the sequence: "; my $filename = <STDIN>; chomp $filename; open my $FH, '<', $filename or die "Cannot open $filename: $!"; my @chars = qw(A C D E F G H I K L M N P Q R S T V W Y); my $length; my $char_regex = join q(), @chars; $char_regex = qr/[$char_regex]/; my %occ; while (my $line = <$FH>) { for my $char (split //, $line) { next unless $char =~ $char_regex; $length++; $occ{$char}++; } } print "AMINO ACID \t OCCURRENCE \t FREQUENCY\n"; for my $char (@chars) { $occ{$char} //= 0; print "$char \t\t $occ{$char} \t\t ", $occ{$char} / $length, "\n" +; }
BTW, the plus sign at 'S' just means your line is too long and has been wrapped. You can adjust your line length in your settings.
لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Code won't proceed after input. by choroba
in thread Code won't proceed after input. by newbie1991

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