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#!/usr/bin/ruby -w
# frozen_string_literal: false
# ch-1.rb
# 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
################################################################################
# Our PWC Solution
################################################################################
def int_sqr_root(input)
if !input.integer? || !input.positive?
puts 'Input must be a positive integer'
return
end
# Crawl through squares starting with 0
i = 0
(i += 1) while i * i <= input
# Return the highest passing number
i - 1
end
################################################################################
# REPL
################################################################################
def print_banner
message = 'Integer Square Root Calculator'
outline = '=' * message.length
puts "\e[36m\n#{outline}\n#{message}\n#{outline}\n\e[0m"
end
prompt = "Enter a positive integer (or, type \"\e[33mexit\e[0m\" to quit)> "
check_continue = "Try again? (\e[33my\e[0m/\e[33mn\e[0m)> "
print_banner
print prompt
loop do
input = gets.chomp
input.strip!
case input
when /\A\d+\z/
puts "Integer square root: #{int_sqr_root(input.to_i)}"
print check_continue
when /\Ay\z/
print prompt
when /\A(exit|n)\z/
puts 'Goodbye.'
exit
else puts 'Arguments must be positive integers only.'
end
end
|
