Outputs each number from 1 to 100, however … when the number is a multiple of 3 print WAKKA instead of that number. When the number is a multiple of 5, print WAAAA instead of that number. For numbers which are multiples of 3 AND 5, print WAKKAWAAAA.

loop_test.rb

#!/usr/bin/env ruby

(1..100).each { |n|
  puts n unless( n%3 == 0 || n%5 == 0)
  puts 'WAKKA' if (n%3 == 0 && n%5 != 0)
  puts 'WAAAA' if (n%5 == 0 && n%3 != 0)
  puts 'WAKKAWAAAA' if (n%3 == 0 && n%5 == 0)
}