國立暨南國際大學 102 學年度第一學期小考試卷

1. (10%) Determine whether the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   
   # Defining Classes (P.333)
   
   class Bozo:
   
       def __init__(self, value):
           print("Creating a Bozo from:", value)
           self.value = 2 * value
   
       def clown(self, x):
           print("Clowning:", x)
           print(x * self.value)
           return x + self.value
   
   def main():
       print("Clowning around now.")
       c1 = Bozo(3)
       c2 = Bozo(4)
       print( c1.clown(3) )
       print( c2.clown(c1.clown(2)) )
   
   main()
   
   
   
2. (10%) Determine whether the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   
   # Useful List-specific Methods (P.345)
   
   aList = [3, 1, 4, 1, 5, 9]
   aList.insert(5, 8)
   aList.insert(7, 8)
   print(aList)
   
   
   
   
3. (10%) Determine whether the following code is correct or not.  If it is correct, predict its output.  If it is incorrect, point out the mistake(s).
   
   # Sorting a List (P.351--355)
   
   class MyPoint:
   
       def __init__(self, x, y):
           self.x = x
           self.y = y
       def __str__(self):
           return '(' + str(self.x) + ',' + str(self.y) + ')'
   
       def descX(self):
           return -self.x
   
   def showPoints(aList):
       for p in aList:
           print( p )
   
   def main():
       points = [ MyPoint(1, 2), MyPoint(2, 7), MyPoint(3, 4),
                   MyPoint(12, 5), MyPoint(6, 8) ]
       points.sort(key=MyPoint.descX)
       showPoints(points)
   
   main()