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#!perl
################################################################################
=comment
Perl Weekly Challenge 011
=========================
Challenge #2
------------
Write a script to create an Indentity Matrix for the given size. For example, if
the size is 4, then create Identity Matrix 4x4. For more information about
*Indentity Matrix*, please read the
[ https://en.wikipedia.org/wiki/Identity_matrix |wiki] page.
=cut
################################################################################
#--------------------------------------#
# Copyright © 2019 Perlmonk Athanasius #
#--------------------------------------#
use strict;
use warnings;
use Const::Fast;
use Scalar::Util::Numeric qw( isint );
const my $DEFAULT_SIZE => 4;
const my $MAX_SIZE => 39; # Adjust for the target console
$| = 1;
MAIN:
{
my $size = $ARGV[0] // $DEFAULT_SIZE;
my $matrix = identity_matrix($size);
print "\nIdentity Matrix of size $size:\n";
print_matrix($matrix);
}
sub identity_matrix
{
my ($size) = @_;
die "Invalid matrix size $size, stopped"
unless isint($size) && $size > 0;
die "Matrix size $size is too wide to be properly displayed, stopped"
if $size > $MAX_SIZE;
my $matrix;
for my $i (0 .. $size - 1)
{
$matrix->[$i][$_] = ($i == $_) ? 1 : 0 for 0 .. $size - 1;
}
return $matrix;
}
sub print_matrix
{
my ($matrix) = @_;
my $size = scalar @$matrix;
if ($size == 1)
{
print '[', $matrix->[0][0], "]\n";
}
else
{
print '|', join( ' ', $matrix->[$_]->@* ), "|\n" for 0 .. $size - 1;
}
}
################################################################################
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