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cs31 lecture 2

18 problem definition x inputs m the number of miles

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Unformatted text preview: ne our formalization of the problem! 18 Problem definition x Inputs: m: the number of miles done sine last refueling g: the number of gallons of gas consumed since last refueling c: the capacity of the gas tank (in gallons) defaultMpg: the usual average mpg of the car x Rules: Hypothesis: the car will have the same mpg for the rest of the Hypothesis: tank than it achieved since the last refuel. tank 19 Problem definition x Rules: If m = 0, then mpg is defaultMpg, else mpg is m / g If m is negative (sensor default), then mpg is defaultMpg If g is negative (sensor default), then milesToRefuel is unknown We assume c and defaultMpg have no error (constants for the car) If g = 0 and m > 0 (electric), then mpg is ‘infinity’ • We select a numerical value, eg, 99, for the mpg in this case 20 A more complete algorithm Algorithm ComputeMilesLeft: IInput: nput: • • • • m: number of miles since last refuel g: number of gallons consumed since last refuel c: the capacity of the gas tank (in gallons) defaultMpg: the default mpg of the car Output: • milesToRefuel: the number of miles before refuel is n...
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