FizzBuzzException.rb

class MyException < Exception; end
class FizzBuzz < MyException; end
class Fizz < MyException; end
class Buzz < MyException; end

i = 1
j = 100

begin
  raise FizzBuzz if i%3  == 0 && i%5 == 0
  raise Fizz     if i%3  == 0
  raise Buzz     if i%5  == 0
  raise
rescue Exception => exp
  puts exp.kind_of?(MyException) ? exp : i
  i += 1
  retry if i <= j
end