Kaprekar number

Hi there reader, happy?

Today I was introduced to the Kaprekar number and decided to check if a given number is a kaprekar one.

Here is what I got:

	number = ARGV[0].to_i
	size = number.to_s.size
	square = (number**2).to_s
	first_half = square.size.even? ? square[0..size-1] : square[0..size-2]
	second_half = square[-size..-1]
	if number == first_half.to_i + second_half.to_i || square.size == 1 && number == square.to_i
	puts "#{number} is a Kaprecar number"
	else
	puts "#{number} is NOT a Kaprecar number"
	end

view raw kaprekar.rb hosted with ❤ by GitHub

To make it run simply:

ruby kaprekar.rb n

Now, be a good person a hug the person next to you =)