FizzBuzz (http://www.codinghorror.com/blog/2007/02/why-cant-programmers-program.html)

fizzbuzz.rb

!#/usr/bin/env ruby
 
=begin
1. Write a program that prints the numbers from 1 to 100.
2. But for multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz".
3. For numbers which are multiples of both three and five print "FizzBuzz".
=end
 
100.times do |count = 0|
  if count % 3 == 0 && count % 5 == 0
    puts 'FizzBuzz'
  elsif count % 3 == 0
    puts 'Fizz'
  elsif count % 5 == 0
    puts 'Buzz'
  else
    puts count += 1
  end
end