multiplesofanumber.rb

=begin
MULTIPLES OF A NUMBER
CHALLENGE DESCRIPTION:
Given numbers x and n, where n is a power of 2, print out the smallest multiple of n which is greater than or equal to x. Do not use division or modulo operator.
INPUT SAMPLE:
The first argument will be a path to a filename containing a comma separated list of two integers, one list per line. E.g.
13,8
17,16
OUTPUT SAMPLE:
Print to stdout, the smallest multiple of n which is greater than or equal to x, one per line. E.g.
16
32
=end

lines = File.readlines(ARGV[0])

lines.each do |line|
  numbers = line.split(",")
  _x = numbers.first.to_i
  _n = numbers.last.to_i
  _multiple = _n
  smallest_multiple_found = false
  while !smallest_multiple_found
    if _n >= _x
      puts _n
      smallest_multiple_found = true
    else
      _n += _multiple
    end
  end
end