Write a program which prints the numbers from 1 to N, each on a new line. But for multiples of three print “Fizz” instead of the number 3 and for the multiples of five print “Buzz”. For numbers which are multiples of both three and five print “FizzBuzz”. Read in the input number from STDIN.Solution below is in ruby.

fizzbuzz.rb

1.upto(STDIN.gets.to_i) do |num|
  break if num > 10**7 # num should be less than 10^7
  output = nil
  output = output.to_s + 'Fizz' if num % 3 == 0
  output = output.to_s + 'Buzz' if num % 5 == 0
  puts output || num
end