How can I write this in a "simpler" way?

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hello dear Monks!
I am again stuck because I am supposed to answer the following question without using the <> operator.
The question is, given a file with numbers, and using the while loop, how can you sum up the values that are in the file?
Of course the easy way would be something like:

$count=0;
while(<>)
{
  $mynumber = $_;
  chomp $mynumber;
  $count +=$mynumber;
}
print $count;
[download]

Any more "primitive" way for this?

Comment on How can I write this in a "simpler" way? Download Code

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Re: How can I write this in a "simpler" way? by thezip (Vicar) on Feb 12, 2014 at 00:15 UTC
YAWTDI... `#!/usr/bin/perl use strict; use warnings; use Tie::File; my $filename = 'data.txt'; tie(my @array, 'Tie::File', $filename) or die "Could not open $filenam +e for reading"; my $total_lines = 0; for (@array) { chomp; $total_lines += $_; } printf "There are %d lines in %s\n", $total_lines, $filename;` [download] My tenacity goes to eleven...	[reply] [d/l]
Re: How can I write this in a "simpler" way? by NetWallah (Canon) on Feb 12, 2014 at 00:10 UTC
How about: `perl -nE "$s+=$_}{say qq\|total $s\|" myfile.txt` [download] (Use single-quotes for Linux). What is the sound of Perl? Is it not the sound of a wall that people have stopped banging their heads against? -Larry Wall, 1992	[reply] [d/l]
Re: How can I write this in a "simpler" way? by choroba (Cardinal) on Feb 11, 2014 at 23:25 UTC
Are you allowed to use the readline function? لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply]
Re^2: How can I write this in a "simpler" way? by Anonymous Monk on Feb 11, 2014 at 23:32 UTC
I think he wants us to use the "defined" function, "readline" will be taught in another day :P	[reply]
Re: How can I write this in a "simpler" way? by LanX (Sage) on Feb 11, 2014 at 23:33 UTC
You need to open a "file" and use a filehandle what you show applies to STDIN only. Cheers Rolf ( addicted to the Perl Programming Language)	[reply]
Re^2: How can I write this in a "simpler" way? by Anonymous Monk on Feb 11, 2014 at 23:45 UTC
Yeah, because technically we haven't reached the files yet, we are supposed to "feed" the input of the file with re-direction to the program, like: `cat MYFILE \| program.pl` [download] so, in that case, I guess what I wrote with defined is the correct way?	[reply] [d/l]
Re: How can I write this in a "simpler" way? by MidLifeXis (Monsignor) on Feb 12, 2014 at 16:54 UTC
`perl -ne '$sum += $_; END { print $sum }'` --MidLifeXis	[reply] [d/l]
Re: How can I write this in a "simpler" way? by Anonymous Monk on Feb 11, 2014 at 23:22 UTC
I just found this: `while(defined $line=<STDIN>) { so something }` [download] Is this the way to go?	[reply] [d/l]
Re^2: How can I write this in a "simpler" way? by choroba (Cardinal) on Feb 11, 2014 at 23:37 UTC
It still uses the `<>` operator, with STDIN as the operand. لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l]
Re^3: How can I write this in a "simpler" way? by Anonymous Monk on Feb 12, 2014 at 00:07 UTC
Yeah, his "problem" is not to use the <> like the general way, <STDIN> is acceptable.	[reply]
Re: How can I write this in a "simpler" way? by Anonymous Monk on Feb 11, 2014 at 23:23 UTC
you fail the test	[reply]

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