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add_subtract.rb
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add_subtract.rb
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@@right = 0
@@counter = 0
def create_question(max = 10)
operators = %w(+ -)
integers = (1 .. 20).to_a
operand1 = (integers.sort_by { rand }).first
operand2 = (integers.sort_by { rand }).first
operator = (operators.sort_by {rand}).first
question = "#{operand1} #{operator} #{operand2}"
if (eval(question) > max || eval(question) <= 0)
return create_question(max)
else
question
end
end
def display_question
question = create_question(100)
answer = process_question(question)
#raise "answer = #{answer} and answer.class = #{answer.class}"
if answer.chomp == 's' || answer.chomp == 'S'
puts "Goed: #{@@right}; fout: #{@@counter - @@right}. Totaal aantal sommen: #{@@counter}"
return
end
if answer.to_i == eval(question)
@@right += 1
puts "Goed!"
else
puts "Fout: #{question} = #{eval(question)}"
end
@@counter += 1
#sleep 1 # wait 1 second
gets
display_question
end
def process_question(question)
print question + " = "
answer = gets
if /\S/ !~ answer
return process_question(question)
end
return answer
end
def start
display_question
end
start