Ruby: Incrementing within a Method

Question

I am trying to create a CLI arithmetic quiz program and am having difficulty keeping the score within the method. I get the following error message whenever I attempt to increment the score variable (which is declared).

main.rb:17:in `ask': undefined method `+' for nil:NilClass (NoMethodError)
        from main.rb:23:in `<main>'

The code is pasted below. I believe I need to use the 'return' statement to do the increment but I am unsure how this works. (Even if this is not the problem, I'd still welcome any help from anyone to explain how you use boolean return values to count.)

def ask(question, answer)
    print question
    user_answer = gets.chomp
    if user_answer == answer
        puts "Correct!"
        score += 1
    else
        puts "Wrong! The answer was #{answer}"
    end
end

Tom Gasaner · Accepted Answer · 2014-11-30 09:47:32Z

2

Your score variable is not declared. You didn't show class implementation, but I suggest you to use attr_writer :score(or attr_accessor :score if you want both get and set var) and set initial value in initialize method.

answered Nov 30, 2014 at 9:47

Tom Gasaner

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Comments

steenslag · Accepted Answer · 2014-11-30 19:53:31Z

2

All local variables inside a method are visible only within the method. Class variables have greater visibility, so renaming score to @score (both inside and outside the method) should be a remedy.

answered Nov 30, 2014 at 19:53

steenslag

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