mirror of
https://github.com/coding-horror/basic-computer-games.git
synced 2025-12-23 07:29:02 -08:00
59 lines
1.2 KiB
Ruby
59 lines
1.2 KiB
Ruby
def intro
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puts " TRAIN
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CREATIVE COMPUTING MORRISTOWN, NEW JERSEY
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TIME - SPEED DISTANCE EXERCISE
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"
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end
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def get_user_guess
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while true
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begin
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number = Float(gets.chomp)
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return number
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rescue ArgumentError
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# Ignored
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end
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puts "!NUMBER EXPECTED - RETRY INPUT LINE"
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print "? "
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end
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end
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def main
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intro
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loop do
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car_speed = rand(25) + 40
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car_time = rand(15) + 5
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train_speed = rand(19) + 20
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print " A CAR TRAVELING #{car_speed} MPH CAN MAKE A CERTAIN TRIP IN
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#{car_time} HOURS LESS THAN A TRAIN TRAVELING AT #{train_speed} MPH.
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HOW LONG DOES THE TRIP TAKE BY CAR? "
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guess = get_user_guess
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answer = ((car_time * train_speed) / (car_speed - train_speed).to_f).round(5)
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delta = (((answer - guess) * 100 / guess) + 0.5).abs.to_i
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if delta > 5
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puts "SORRY. YOU WERE OFF BY #{delta} PERCENT."
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else
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puts "GOOD! ANSWER WITHIN #{delta} PERCENT."
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end
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print "CORRECT ANSWER IS #{answer == answer.to_i ? answer.to_i : answer} HOURS.
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ANOTHER PROBLEM (YES OR NO)? "
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option = (gets || '').chomp.upcase
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break unless option == 'YES'
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end
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end
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trap "SIGINT" do puts; exit 130 end
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main
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