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Daily Challenge #106 - Average Fuel Consumption

dev.to staff on November 03, 2019

You've just returned from a road trip and are curious about your car's fuel consumption during the trip. Unfortunately, you didn't reset the counte...
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matissg profile image
matissg •

Ruby:

# frozen_string_literal: true

require 'json'
# Save file as fuel.rb and then run `ruby fuel.rb [7.9,100] [7.0,600]`
class FuelConsumption
  def initialize(before, after)
    @before = JSON.parse(before)
    @after = JSON.parse(after)
  end

  def calculate
    trip = @after[1] - @before[1]
    puts(
      ((consumed(@after) - consumed(@before)) / trip).round(1)
    )
  end

  def consumed(data)
    data[1] * data[0]
  end
end

FuelConsumption.new(*ARGV).calculate
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wolverineks profile image
Kevin Sullivan • • Edited

typescript

interface Reading {
  centilitersPerKilometer: number;
  km: number;
}

const roundToPlaces = (places: number, value: number) =>
  +(Math.round(((value + `e+${places}`) as unknown) as number) + `e-${places}`);

const avgFuelConsumption = (start: Reading, end: Reading) => {
  const beforeConsumptionInCentiliters =
    start.km * start.centilitersPerKilometer;

  const afterConsumptionInCentiliters = end.km * end.centilitersPerKilometer;

  const consumptionInCentiliters =
    afterConsumptionInCentiliters - beforeConsumptionInCentiliters;

  const distanceInKilometers = end.km - start.km;

  const centilitersPerKilometer =
    consumptionInCentiliters / distanceInKilometers;

  return roundToPlaces(1, centilitersPerKilometer);
};
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aminnairi profile image
Amin • • Edited

Haskell

average :: Float -> Float -> Float -> Float -> Float
average x1 x2 y1 y2 =
    (fromIntegral $ round $ (y1 * y2 - x1 * x2) * 100 / (y2 - x2) / 100 * 10) / 10

main :: IO ()
main = do
    print $ average 7.9 100 7 200 -- 6.1
    print $ average 7.9 500 7 600 -- 2.5
    print $ average 7.9 100 7 600 -- 6.8

Playground

Hosted on Repl.it.

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arjunjv profile image
sai kiran jv •

the code is self-explanatory

def avg_fuel_consumption(before, after):
avg_bef = before[0] * (before[1] / 100)
avg_aft = after[0] * (after[1] / 100)
avg_current = avg_aft - avg_bef
print("The average fuel consumption during hte trip is :", avg_current)

def worker_method():
before = []
after = []

before.append(float(input("Enter the average consumption before trip: ")))
before.append(int(input("Enter the distance travelled  before trip: ")))
after.append(float(input("Enter the average consumption after trip: ")))
after.append(int(input("Enter the distance travelled  after trip: ")))

return (avg_fuel_consumption(before,after))

if name == 'main':
worker_method()
while True:
answer = input("Would you like to try again? Y/N: ").lower()
if answer == 'y':
worker_method()
elif answer == 'n':
break
else:
answer = raw_input('Incorrect option. Type "YES" to try again or "NO" to leave": ').lower()

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qm3ster profile image
Mihail Malo •

Extra credit: Convert from l/100km to SI units and visualize the resulting quantity.

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aminnairi profile image
Amin •

So like in Kg? I'm not sure I understood the principle behind the SI units. Could you bring some light to it?

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qm3ster profile image
Mihail Malo •

what-if.xkcd.com/11/