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|
#!perl
###############################################################################
=comment
Perl Weekly Challenge 091
=========================
Task #1
-------
*Count Number*
Submitted by: Mohammad S Anwar
You are given a positive number $N.
Write a script to count number and display as you read it.
Example 1:
Input: $N = 1122234
Output: 21321314
as we read "two 1 three 2 one 3 one 4"
Example 2:
Input: $N = 2333445
Output: 12332415
as we read "one 2 three 3 two 4 one 5"
Example 3:
Input: $N = 12345
Output: 1112131415
as we read "one 1 one 2 one 3 one 4 one 5"
=cut
###############################################################################
#--------------------------------------#
# Copyright © 2020 PerlMonk Athanasius #
#--------------------------------------#
use strict;
use warnings;
use Const::Fast;
use Regexp::Common qw( number );
const my $USAGE =>
"Usage:
perl $0 <N>
<N> A positive integer\n";
#------------------------------------------------------------------------------
BEGIN
#------------------------------------------------------------------------------
{
$| = 1;
print "\nChallenge 091, Task #1: Count Number (Perl)\n\n";
}
#==============================================================================
MAIN:
#==============================================================================
{
my $N = parse_command_line();
print "Input: \$N = $N\n";
print 'Output: ';
my @digits = split //, $N;
my $last_digit = shift @digits;
my $count = 1;
# Note: the test for definedness is needed for when $next_digit is zero
while (defined(my $next_digit = shift @digits))
{
if ($next_digit == $last_digit)
{
++$count;
}
else
{
print "$count$last_digit";
$last_digit = $next_digit;
$count = 1;
}
}
print "$count$last_digit\n";
}
#------------------------------------------------------------------------------
sub parse_command_line
#------------------------------------------------------------------------------
{
my $args = scalar @ARGV;
$args == 0 and error( 'No command-line arguments found' );
$args == 1 or error( 'Too many command-line arguments' );
my $N = $ARGV[0];
$N =~ / \A $RE{num}{int} \z /x or error( qq["$N" is not an integer] );
$N > 0 or error( qq["$N" is not positive] );
return $N;
}
#------------------------------------------------------------------------------
sub error
#------------------------------------------------------------------------------
{
my ($message) = @_;
die "ERROR: $message\n$USAGE";
}
###############################################################################
|
