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#!/usr/bin/perl
# ch-1.pl
=begin comment
* https://theweeklychallenge.org/blog/perl-weekly-challenge-133/
*
* Task 1 > Integer Square Root
* ============================
*
* You are given a positive integer `$N`.
*
* Write a script to calculate the integer square root of the given number.
*
* Please avoid using built-in function. Find out more about it here
* (https://en.wikipedia.org/wiki/Integer_square_root).
*
* Examples
* --------
*
* Input: $N = 10
* Output: 3
*
* Input: $N = 27
* Output: 5
*
* Input: $N = 85
* Output: 9
*
* Input: $N = 101
* Output: 10
=end comment
=cut
use strict;
use warnings;
use utf8;
use open ':std', ':encoding(UTF-8)';
use Term::ANSIColor;
################################################################################
# Our PWC Solution
################################################################################
sub return_int_sqr_root {
my $input = shift;
chomp $input;
# Validate input
$input =~ s{
^\s+ # Leading whitespace
|
\s+$ # Trailing whitespace
}{}gmx;
if ( !$input =~ /^\d+$/m ) {
return;
}
# Crawl through squares starting with 0
my $i = 0;
while ( $i * $i <= $input ) {
$i++;
}
# Return the highest passing number
return --$i;
}
################################################################################
# Utilities
################################################################################
sub print_banner {
my $message = 'Integer Square Root Calculator';
my $border = q{=} x length $message;
my $empty = q{};
my @elements = ( $empty, $border, $message, $border, $empty, $empty );
return print color('cyan'), join( "\n", @elements ), color('reset');
}
################################################################################
# REPL
################################################################################
sub main {
my $prompt =
'Enter a positive integer (or, type "'
. color('yellow') . 'exit'
. color('reset')
. '" to quit)> ';
my $retry =
'Try again? ('
. color('yellow') . 'y'
. color('reset') . q{/}
. color('yellow') . 'n'
. color('reset') . ')> ';
print_banner();
print $prompt;
my $complete = 0;
while ( my $line = <> ) {
chomp $line;
$line =~ s{
^\s+ # Remove leading whitespace
|
\s+$ # Remove trailing whitespace
}{}gmx;
if ( $line eq 'exit' || $line eq 'n' ) {
print "Goodbye.\n";
return 1;
}
if ( $line eq 'y' ) {
$complete = 0;
print $prompt;
next;
}
if ( $line =~ m/^\d+$/m && !$complete ) {
print 'Integer square root: ';
print color('yellow'), return_int_sqr_root($line), color('reset'), "\n";
}
elsif ($complete) {
print "\n", $retry;
}
else {
print "Arguments must be positive integers only.\n";
}
$complete = 1;
print $retry;
}
return 1;
}
main();
|
