Ruby program to calculate generic root



Write a Ruby program to calculate generic root.

Generic Root: It sum of digits of a number unit we don't get a single digit.
Example:

Generic root of 4563: 4+5+6+3 = 18 since 18 is two digit numbers so 1 + 8 = 9
So, generic root of 4563 = 9


class GenericRoot
  def getGenericRoot
    sum = 0 
    rem = 0 
    print "Enter the number: "
    num = gets.chomp.to_i 
    while num >= 10 do
      sum = 0 
      while num != 0 do
        rem = num % 10 
        num = num / 10 
        sum += rem 
      end 
      (sum >= 10) ? (num = sum) : break
    end
    print "Generic root of given number is :" + sum.to_s
  end
end

p = GenericRoot.new 
p.getGenericRoot

Output:

Enter the number:  123456
Generic root of given number is :3