From: "Mayank K." <mayank.kohaley@...>
Date: 2011-03-23T18:57:43+09:00
Subject: Nil can't be coerced into Fixnum (TypeError)

I am trying to execute the following code and it seems like the array is
going out of bounds. Let me know where am I going wrong.

class PrimeFactor
  def initialize(number)
    @number = number
  end

  def primeFactors
    factors = Array.new
    (2..Math.sqrt(@number).ceil).each do |num|
      if ( @number % num == 0 )
        factors.insert(factors.length,num)
      end
    end
    (0...factors.length).each do |i|
      prime = factors[i]
      factors = factors.select { |x| x == prime || x % prime !=0 }
    end

    factors.compact.join(',')
  end
end

prime = PrimeFactor.new(13195)
puts "#{prime.primeFactors}"

C:\Temp\Study\Ruby>ruby --version
ruby 1.8.7 (2011-02-18 patchlevel 334) [i386-mingw32]

C:\Temp\Study\Ruby>ruby prime.rb
prime.rb:16:in `%': nil can't be coerced into Fixnum (TypeError)
        from prime.rb:16:in `primeFactors'
        from prime.rb:16:in `select'
        from prime.rb:16:in `primeFactors'
        from prime.rb:14:in `each'
        from prime.rb:14:in `primeFactors'
        from prime.rb:24

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