'''lecture_09_mpg.py
Calculates and makes a decision about a car's MPG
Oliver W. Layton
Lecture 09
CS151: Computational Thinking: Visual Media
Spring 2021
'''


def computeMPG(miles, gasUsed):
    '''Calculate miles-per-gallon, given miles traveled and gallons used'''
    mpg = miles / gasUsed # 300 / 10 = 30.0
    return mpg


def goodMileage(mpg):
    '''Report how good the gas mileage as miles-per-gallon is'''
    if mpg > 50:
        print(mpg, 'mpg is great gas mileage!')
    elif mpg >= 30:
        print(mpg, 'mpg is pretty good gas mileage.')
    elif mpg >= 20:
        print(mpg, 'mpg is acceptable.')
    else:
        print('The gas mileage is not great!')


# main code
# Calculate the MPG of our trip and determine how good it is
miles = 300
tank = 10
myMPG = computeMPG(miles, tank) # myMPG = 30.0
goodMileage(myMPG) # goodMileage(30.0)