Ruby Solution To Reddit Daily Programmer #218

num_palindrome.rb

#!/usr/env/ruby

#Function to test if the current value is a palindrome!
def is_palindrome(num)
    len = num.to_s.length
    numArr = num.to_s.split("")
    is_pal = true

    #Loop through the array, comparing the beginning to the end.
    for i in 0...len/2
        if numArr[i] != numArr[i * (-1) -1]
           is_pal = false
        end
    end

    #Return what we found.
    return is_pal
end

#Function to flip the values and add them.
def flip_and_add(num)
    flipped = ""
    num_string = num.to_s

    #Loop through the number, flipping it.
    len = num_string.to_s.length
    for i in 0...len
        flipped = num_string[i] + flipped
    end

    #Add the numbers.
    return num + flipped.to_i
end

#First get the original number to check.
og_num = 196196871
number = og_num
is_pal = false
steps = 0

#Loop through until we hit a palindrome.
while !is_pal
    #Check to see if it is one now.
    is_pal = is_palindrome(number)

    #Either break now or flip and add.
    if is_pal
        break
    else
        #Need to flip and add the values.
        steps += 1

        #Call the function to flip and add.
        number = flip_and_add(number)
    end
end

#Print the findings.
puts "#{og_num} gets palindromic after #{steps} steps: #{number}"