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ch-2.pl
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ch-2.pl
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#!perl
################################################################################
=comment
Perl Weekly Challenge 243
=========================
TASK #2
-------
*Floor Sum*
Submitted by: Mohammad S Anwar
You are given an array of positive integers (>=1).
Write a script to return the sum of floor(nums[i] / nums[j]) where 0 <= i,j <
nums.length. The floor() function returns the integer part of the division.
Example 1
Input: @nums = (2, 5, 9)
Output: 10
floor(2 / 5) = 0
floor(2 / 9) = 0
floor(5 / 9) = 0
floor(2 / 2) = 1
floor(5 / 5) = 1
floor(9 / 9) = 1
floor(5 / 2) = 2
floor(9 / 2) = 4
floor(9 / 5) = 1
Example 2
Input: @nums = (7, 7, 7, 7, 7, 7, 7)
Output: 49
=cut
################################################################################
#--------------------------------------#
# Copyright © 2023 PerlMonk Athanasius #
#--------------------------------------#
#===============================================================================
=comment
Interface
---------
If no command-line arguments are given, the test suite is run.
=cut
#===============================================================================
use v5.32.1; # Enables strictures
use warnings;
use Const::Fast;
use Regexp::Common qw( number );
use Test::More;
const my $USAGE =>
"Usage:
perl $0 [<nums> ...]
perl $0
[<nums> ...] A list of positive integers (>= 1)\n";
#-------------------------------------------------------------------------------
BEGIN
#-------------------------------------------------------------------------------
{
$| = 1;
print "\nChallenge 243, Task #2: Floor Sum (Perl)\n\n";
}
#===============================================================================
MAIN:
#===============================================================================
{
if (scalar @ARGV == 0)
{
run_tests();
}
else
{
my $nums = parse_command_line();
printf "Input: \@nums = (%s)\n", join ', ', @$nums;
my $sum = floor_sum( $nums );
print "Output: $sum\n";
}
}
#-------------------------------------------------------------------------------
sub floor_sum
#-------------------------------------------------------------------------------
{
my ($nums) = @_;
my $sum = 0;
for my $i (0 .. $#$nums)
{
for my $j (0 .. $#$nums)
{
# int() is equivalent to floor() when the argument is known to be
# positive
$sum += int( $nums->[ $i ] / $nums->[ $j ] );
}
}
return $sum;
}
#-------------------------------------------------------------------------------
sub parse_command_line
#-------------------------------------------------------------------------------
{
for (@ARGV)
{
/ ^ $RE{num}{int} $ /x or error( qq["$_" is not a valid integer] );
$_ >= 1 or error( qq["$_" is not positive (>= 1)] );
}
return \@ARGV;
}
#-------------------------------------------------------------------------------
sub run_tests
#-------------------------------------------------------------------------------
{
print "Running the test suite\n";
while (my $line = <DATA>)
{
chomp $line;
my ($test_name, $nums_str, $exp_str) = split / \| /x, $line;
for ($test_name, $nums_str, $exp_str)
{
s/ ^ \s+ //x;
s/ \s+ $ //x;
}
my @nums = split / \s+ /x, $nums_str;
my $sum = floor_sum( \@nums );
is $sum, $exp_str, $test_name;
}
done_testing;
}
#-------------------------------------------------------------------------------
sub error
#-------------------------------------------------------------------------------
{
my ($message) = @_;
die "ERROR: $message\n$USAGE";
}
################################################################################
__DATA__
Example 1|2 5 9 | 10
Example 2|7 7 7 7 7 7 7 | 49
Series |1 2 3 4 5 6 7 8 9 10|127