Ruby is_prime? method example

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DATE: May 21, 2015, 1:48 p.m.

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  1. # Checking whether a number is prime can be
  2. # much simpler than this. But this example demonstrates
  3. # loop construct and duck-typing.
  5. # A simple duck-typing example.
  6. # Add a new method/functionality to an existing class
  7. class Fixnum
  8. def is_prime?
  9. (2..Math.sqrt(self).floor).each {|x| return false if self % x == 0 }
  10. return true
  11. end
  12. end
  15. loop do
  16. print "Enter a number (0 to exit): "
  17. num = gets.to_i
  18. break if num == 0
  19. puts "#{num} is" + (num.is_prime? ? " " : " NOT ") + "prime."
  20. end
  21. - See more at: http://www.chandrashekar.info/vault/ruby-scripts/loops.html#sthash.GbDNNtmh.dpuf
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