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HappyNumber
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| #require 'byebug' | |
| class HappyNumberEngine | |
| attr_accessor :visited_numbers | |
| def initialize | |
| @visited_numbers = [] # the container that collects the visited number. | |
| end | |
| def happy_number_minner(num) | |
| if need_squared?(num) # checking if squaring needed . Allow squaring except for 1. | |
| squared_num = single_digit_squared(num.to_s) #digits individual square sum | |
| if already_visited_number?(squared_num) #check if its already visited | |
| @visited_numbers.push(squared_num) | |
| return false | |
| end | |
| @visited_numbers.push(num) # push the visited number into the stack | |
| happy_number_minner(squared_num) # repeat for next number | |
| else | |
| @visited_numbers.push(num) | |
| num == 1 && true || happy_number_minner(num) | |
| end | |
| end | |
| def is_happy_number?(a_num) | |
| happy_number_minner(a_num) | |
| end | |
| private | |
| def need_squared?(num) | |
| return true unless num == 1 | |
| end | |
| def single_digit_squared(string_num) | |
| string_num.split('').reduce(0) {|sum, item| sum + get_square(item.to_i)} | |
| end | |
| def get_square(num) | |
| num*num | |
| end | |
| def already_visited_number?(num) | |
| @visited_numbers.include?(num) | |
| end | |
| end | |
| def happy_number?(num) | |
| happy_number = HappyNumberEngine.new() | |
| happy_number.is_happy_number?(num) | |
| # numbers = [1,2,3,4,5,6,7,8,9,10] | |
| # numbers.each do |num| | |
| # happy_number.visited_numbers = [] | |
| # print num,'--',happy_number.is_happy_number?(num),"--",happy_number.visited_numbers,"\n" | |
| # end | |
| end | |
| if __FILE__ == $0 | |
| print happy_number?(1) | |
| end |
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This logic checks if the given number is happy_number or not.