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|
#!perl
################################################################################
=comment
Perl Weekly Challenge 258
=========================
TASK #1
-------
*Count Even Digits Number*
Submitted by: Mohammad Sajid Anwar
You are given a array of positive integers, @ints.
Write a script to find out how many integers have even number of digits.
Example 1
Input: @ints = (10, 1, 111, 24, 1000)
Output: 3
There are 3 integers having even digits i.e. 10, 24 and 1000.
Example 2
Input: @ints = (111, 1, 11111)
Output: 0
Example 3
Input: @ints = (2, 8, 1024, 256)
Output: 1
=cut
################################################################################
#--------------------------------------#
# Copyright © 2024 PerlMonk Athanasius #
#--------------------------------------#
#===============================================================================
=comment
Assumption
----------
"Positive" integers are greater than or equal to zero.
Interface
---------
1. If no command-line arguments are given, the test suite is run. Otherwise:
2. If $VERBOSE is set to a true value, the required output is followed by a list
of the even-digit numbers found.
=cut
#===============================================================================
use v5.32.1; # Enables strictures
use warnings;
use Const::Fast;
use Regexp::Common qw( number );
use Test::More;
const my $VERBOSE => 1;
const my $USAGE => <<END;
Usage:
perl $0 [<ints> ...]
perl $0
[<ints> ...] A non-empty list of positive integers
END
#-------------------------------------------------------------------------------
BEGIN
#-------------------------------------------------------------------------------
{
$| = 1;
print "\nChallenge 258, Task #1: Count Even Digits Number (Perl)\n\n";
}
#===============================================================================
MAIN:
#===============================================================================
{
if (scalar @ARGV == 0)
{
run_tests();
}
else
{
my @ints = @ARGV;
for (@ints)
{
/ ^ $RE{num}{int} $ /x or error( qq["$_" is not a valid integer] );
$_ >= 0 or error( "$_ is negative" );
}
printf "Input: \@ints = (%s)\n", join ', ', @ints;
my $evens = find_even_digit_numbers( \@ints );
printf "Output: %d\n", scalar @$evens;
if ($VERBOSE)
{
printf "\nEven-digit integers: %s\n",
join ', ', sort { $a <=> $b } @$evens;
}
}
}
#-------------------------------------------------------------------------------
sub find_even_digit_numbers
#-------------------------------------------------------------------------------
{
my ($ints) = @_;
my @evens;
for my $i (@$ints)
{
push @evens, $i if length( $i ) % 2 == 0;
}
return \@evens;
}
#-------------------------------------------------------------------------------
sub run_tests
#-------------------------------------------------------------------------------
{
print "Running the test suite\n";
while (my $line = <DATA>)
{
chomp $line;
my ($test_name, $int_str, $expected) = split / \| /x, $line;
for ($test_name, $int_str, $expected)
{
s/ ^ \s+ //x;
s/ \s+ $ //x;
}
my @ints = split / \s+ /x, $int_str;
my $evens = find_even_digit_numbers( \@ints );
is scalar @$evens, $expected, $test_name;
}
done_testing;
}
#-------------------------------------------------------------------------------
sub error
#-------------------------------------------------------------------------------
{
my ($message) = @_;
die "ERROR: $message\n$USAGE";
}
################################################################################
__DATA__
Example 1| 10 1 111 24 1000|3
Example 2|111 1 11111 |0
Example 3| 2 8 1024 256 |1
|
