Re^4: Print contents of text file line by line

in reply to Re^3: Print contents of text file line by line
in thread Print contents of text file line by line

So I corrected my code and added this to create an array: my @line = <$fh>;

how can I add an if statement to check if the 7th element of the array does exist?

I've tried something like this but it did not work:

 if ($line[6]){
print "Support Group: $line[6]";
}else
print "Support Group:UNKNOWN $line[6]";
[download]

Thanks,

Comment on Re^4: Print contents of text file line by line Download Code

Replies are listed 'Best First'.
Re^5: Print contents of text file line by line by hippo (Bishop) on Jun 25, 2018 at 14:37 UTC
if the 7th element of the array does exist? You have to be pedantic if you are to be a programmer. The 7th element will always exist unless the array has fewer than 7 elements. But it might be undef or empty or whitespace, etc. so you need to be specific about what your condition to be evaluated is. This example checks for something other than whitespace: `#!/usr/bin/env perl use strict; use warnings; my @line = <DATA>; print "OMG, line 7 is missing/blank!!!\n" unless $line[6] =~ /\S/; __DATA__ 1 2 3 4 5 6 8 9` [download] "It doesn't work" is as useful to a developer as "I'm ill" is to a medic. Try to be specific. SSCCE is best.	[reply] [d/l]

Replies are listed 'Best First'.

Re^5: Print contents of text file line by line
by hippo (Bishop) on Jun 25, 2018 at 14:37 UTC

if the 7th element of the array does exist?

You have to be pedantic if you are to be a programmer. The 7th element will always exist unless the array has fewer than 7 elements. But it might be undef or empty or whitespace, etc. so you need to be specific about what your condition to be evaluated is. This example checks for something other than whitespace:

#!/usr/bin/env perl 
use strict;
use warnings;

my @line = <DATA>;
print "OMG, line 7 is missing/blank!!!\n" unless $line[6] =~ /\S/;

__DATA__
1
2
3
4
5
6

8
9
[download]

"It doesn't work" is as useful to a developer as "I'm ill" is to a medic. Try to be specific. SSCCE is best.

[reply]
[d/l]

In Section Seekers of Perl Wisdom