From: "list. rb" <list.rb@...>
Date: 2009-10-11T01:45:49+09:00
Subject: Re: Trouble with local variables

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Content-Type: text/plain; charset=ISO-8859-1

On Sat, Oct 10, 2009 at 11:58 AM, Severin Newsom
<severin.newsom@gmail.com>wrote:

> Hello everyone!
> I've been coding with Ruby for about three days, and I just ran into my
> first big snag. I've been working on a quiz, and the first one had
> questions like this:
>
> puts 'How many classes have a taunt kill?'
> puts 'A - Three'
> puts 'B - Four'
> puts 'C - Five'
> puts 'D - Six'
> answer = gets.chomp.downcase
> if (answer == 'd')
>  score = score + 1
> else
> end
>
> But it's messy, since I have to repeat the code for every question. (I
> know, I know, DRY). With this in mind, I began construction on quiz2,
> and used this as my prototype:
>
> def check
> answer = gets.chomp.downcase
> if (answer == c_answer)
>  score = score + 1
> else
>  puts 'The correct answer was ' + c_answer + '.'
> end
> end
> puts 'Which is the slowest class?'
> puts 'A - Pyro'
> puts 'B - Demoman'
> puts 'C - Heavy'
> puts 'D - Soldier'
> c_answer = 'c'
> check
>
> I understand the problem (mostly), but I'm looking for a workaround.
> Most of my 'fixes' don't work because of the 'A, B, C, D' system; should
> that system be changed?
>
> Sorry for such a long post, I've just really gotten into this.
> --
> Posted via http://www.ruby-forum.com/.
>
>

#checker
def correct?(item)
  letters = %w(A B C D E F G)
puts item[:question] + '?'
item[:choices].each_with_index {|choice,i|
puts "#{letters[i]} - #{choice}"
}
return
item[:solution].call(item[:choices][letters.index(gets.to_s.strip.chomp.upcase)])
rescue false
end

#setup
correct = 0
questions = [
  {
    :question => "Which is the slowest class",
    :choices => %w(Pyro Demoman Heavy Soldier),
    :solution => lambda {|input| input == 'Heavy'}
  },
  {
      :question => "What is the best programming language ever",
      :choices => %w(whitespace ruby),
      :solution => lambda {|input| input == 'ruby'}
  }
]

# do work
questions.each {|question|
  correct +=1 if correct? question
}

#results

puts "correct: #{correct}, incorrect: #{questions.size-correct} score:
#{correct/questions.size.to_f*100}%"

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