On Mon, Oct 5, 2009 at 16:49, Slick <jho251...@yahoo.com> wrote:
> Just clarification. At this time I have not written any of my code (dont'
> know where to begin yet,
snip
Choose a simple project. If you are already familiar with the standard
UNIX utilities, reimplementing them is a good way to learn the
language. For instance, here is a minimal version of cat:
#!/usr/bin/perl
use strict;
use warnings;
while (my $line = <>) {
print $line;
}
Take a look at the man page for cat and try to add some more of its
functionality (like line numbering).
snip
> however the website that I am looking at perl.begin.org seems to have
> diffrent methods for one item. I have seen @ for arrays written like this:
> �...@myarray ,but I have also seen an array per the perl.begin.org writting
> like: $primes[$num_primes]. Are they both the same? Because it would be
> easier in my opinion to write:
>
> @myarray = 4;
> instead of writing this:
> $primes[$num_primes] = 2;
>
> Am I mising something, or are these two things interchangable?
snip
@a is an array, $a[4] is the 5th element of the array @a. Examine this code:
#!/usr/bin/perl
use strict;
use warnings;
#decale the array @a
my @a;
#read lines from STDIN
while (my $line = <STDIN>) {
#if the line matches the word exit by itself, then exit this loop
last if $line =~ /^exit$/;
#remove the end-of-line character(s)
chomp $line;
#add $line to the end of the array @a
push @a, $line;
}
#create a list of numbers from 0 to the last index of @a ($#a)
#and loop over that list assigning each item to $i
for my $i (0 .. $#a) {
#print $i and the corresponding item in @a
print "$i: $a[$i]\n";
}
--
Chas. Owens
wonkden.net
The most important skill a programmer can have is the ability to read.
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