def accelerate
    puts "Stepping on the gas"
    puts "Speeding up"
end

def sound_horn
    puts "Pressing the horn button"
    puts "Beep beep!"
end

def use_headlights(brightness)
    puts "Turning on #{brightness} headlights"
    puts "Watch out for deer!"
end

def use_headlights(brightness = "low-beam")
    puts "Turning on #{brightness} headlights"
    puts "Watch out for deer!"
end

def mileage(miles_driven, gas_used)
    return miles_driven / gas_used
end

trip_mileage = mileage(400, 12)
puts "You got #{trip_mileage} MPG on this trip."

lifetime_mileage = mileage(11432, 366)
puts "This car averages #{lifetime_mileage} MPG."