Midterm Review Questions Answers

Part A: Multiple Choice Questions 
    1. d   2. b,d 3. d   4. b   5. c
    6. d   7. c   8. c   9. c  10. c
   11. c  12. b  13. d  14. d  15. c
   
Part B: Predict the Output

    1.    a     b       Output: 
        -----+-----       31 47
           8    5
          47   31
          
    2.    a     b   a + b   Output:
        -----+-----+-----     4 15
           2     5     7      12 60
           4    15    17      72
          12    60    72
          
               s                t          Output:
    3.  ----------------+----------------  ababbabababab
               "a"             "b"
             "abab"        "babababab"
             
Part C: Correct the Errors

# 1.
# Script with errors:
x1 = input("Enter float value x1: ")
y1 = input("Enter float value y1: ")
x2 = input('Enter float value x2: ')
y2 = input(Enter float value y2:)
distance = (x2 - x2 ** 2 + x2 - x2 ** 2) ** 1 / 2
print("Distance between points ({x1},{y1}) and ({x2},[y2] is")
print(round(dist, 2))

# Corrected script:
x1 = input("Enter float value x1: ")
y1 = input("Enter float value y1: ")
x2 = input('Enter float value x2: ')
y2 = input("Enter float value y2: ")
distance = ((x2 - x2) ** 2 + (x2 - y2) ** 2) ** (1 / 2)
print(f"Distance between points ({x1},{y1}) and ({x2},{y2} is")
print(round(distance, 2))

# 2.
# Script with errors:
fin = open("michigan-cities.txt", r)
line = readline(fin)
while line ! = ""
    maxpop = 10000000
    maxcity = "'
    fields = line_split(',')
    city = fields[0].strip
    state = fields[1].strip
    population = fields(3).strip
    if state = MI
        if population > maxpop
            maxpop = population
            city = maxcity
        line = fin.readline( )

if maxpop = 10000000:
    print 'No cities in input file.\n'
else
    print("Largest city in {state} is [city]."
end

# Corrected script:

maxpop = -1
maxcity = ""
fin = open("cities.txt", "r")

# Throw away header line
fin.readline( )
line = fin.readline( )
while line != "":
    fields = line.split(';')
    city = fields[0].strip( )
    state = fields[1].strip( )
    population = int(fields[2].strip( ))
    if state == "MI":
        if population > maxpop:
            maxpop = population
            maxcity = city
    line = fin.readline( )
     
if maxpop == -1:
    print('No cities in input file.')
else:
    print(f"Largest city in MI is {maxcity}.")