Peer Instruction: Functions Multiple Choice Questions

Q-1: What does the following code print?

def foo():
        print("Raaarrr I'm a bear")

def bar():
        print("Eeek a bear!")

foo()

• Raaarrr I'm a bear
• Correct! The function "foo()" has been called in the last line. So, the print statement under it will be executed.
• Eeek a bear!
• Incorrect! The function "foo()" has been called in the last line and NOT "bar()". So, the print statement under "foo()" will be executed and returned.
• Both
• Incorrect! The function "foo()" has been called in the last line and NOT "bar()". So, the print statement under "foo()" will be executed and returned.
• Neither
• Incorrect! The function "foo()" has been called in the last line and NOT "bar()". So, the print statement under "foo()" will be executed and returned.
• I don't know
• Incorrect! The function "foo()" has been called in the last line and NOT "bar()". So, the print statement under "foo()" will be executed and returned.

Q-2: What does the following code print?

def first(a):
   a=8

a = 20
first(a)
print(a)

• 0
• Incorrect! Change in the values of a function's arguments doesn't change the assigned value of a variable. Try replacing "first(a)" with "first(x)" in function definition.
• 8
• Incorrect! Change in the values of a function's arguments doesn't change the assigned value of a variable. Try replacing "first(a)" with "first(x)" in function definition.
• 20
• Correct! Change in the values of a function's arguments doesn't change the assigned value of a variable.
• Error, because a cannot be assigned in two places
• Incorrect! Change in the value of a function's arguments doesn't change the assigned value of a variable. Try replacing "first(a)" with "first(x)" in function definition.
• I don't know
• Incorrect! Change in the values of a function's arguments doesn't change the assigned value of a variable. Try replacing "first(a)" with "first(x)" in function definition.

Q-3: What does the following code print?

def calculate(w, x, y):
   a=x
   b=w+1
   return a + b + 3

print(calculate(3, 2, 0))

• 5
• Incorrect! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.
• 9
• Correct! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.
• 0
• Incorrect! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.
• 3
• Incorrect! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.
• I don't know
• Incorrect! Here, a=x=2 and b= 3+1 = 4. So, a + b + 3 = 2 + 4 + 3 = 9.

Q-4: Which sets x to the value 5?

def f1():
   return 5

def f2():
   print(5)

def f3():
   return print(5)

• x = f1()
• Correct! Only function "f1()" has a return statement.
• x = f2()
• Incorrect! Only function "f1()" has a return statement.
• x = f3()
• Incorrect! Only function "f1()" has a return statement.
• All of the above
• Incorrect! Only function "f1()" has a return statement.
• I don't know
• Incorrect! Only function "f1()" has a return statement.

Q-5: Which of the following are true about this code?

def add_one(x):
return x + 1

x = 2
x = x + add_one(x)

• No bugs. The code is fine.
• Incorrect! Body of the function is not indented.
• The function body is not indented.
• Correct! Function body should be indented in Python.
• We use x as both a parameter and a variable, but we are not allowed to do that
• Incorrect! x can be defined as both a parameter and variable in Python.
• B and C
• Incorrect! Function body should be indented in Python. x can be defined as both a parameter and variable in Python.
• I don't know
• Incorrect! Body of the function is not indented.

Q-6: What does the following code print?

def odd(y,x):
   y = y +1
   x = x + 1
   print(x*y)

def main():
   x = 2
   y = 4
   odd(x,y)
   print(x*y)

• 8, 8
• Incorrect! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.
• 15, 15
• Incorrect! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.
• 8, 15
• Incorrect! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.
• 15, 8
• Correct! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.
• I don't know
• Incorrect! Here, odd(4, 2) will return 15 (y = y + 1 = 5 and x = x + 1 = 3) and print(x*y) in main() will return 8. The output of odd() will be printed first as it is initialized first.

Q-7: One of the components of this function is inconsistent with the rest. Which is it?

def sum_eleven(num1, num2, num3):
   '''(int, int, int) -> bool
   Return True iff num1, num2, and num3 sum to 11.
   >>>sum_eleven (4, 5, 2)
   11
   '''
   return num1 + num2 + num3 == 11

• Example
• Correct! The function returns a boolean but the example returns an integer.
• Type contract
• Incorrect! The name and type of parameters have been clearly defined. Option A is the answer becauase the function returns a boolean but the example returns an integer.
• Header
• Incorrect! The syntax of function's header is correct. Option A is the answer becauase the function returns a boolean but the example returns an integer.
• Description
• Incorrect! The function has been clearly descibed. Option A is the answer becauase the function returns a boolean but the example returns an integer.
• Body
• Incorrect! The body of the function has been defined accurately. Option A is the answer becauase the function returns a boolean but the example returns an integer.

Q-8: One of the components of this function is inconsistent with the rest. Which is it?

def rightmost_digit(a):
   '''(int) -> bool
   Return the rightmost digit of a.
   >>>rightmost_digit (14)
   4
   '''
   return a % 10

• Example
• Incorrect! The example has been correctly defined. Option B is right because the function returns an integer but the type of contract indicates bool.
• Type contract
• Correct! Option B is right because the function returns an integer but the type of contract indicates bool.
• Header
• Incorrect! The syntax of function's header is correct. Option B is right because the function returns an integer but the type of contract indicates bool.
• Description
• Incorrect! The function has been clearly descibed. Option B is right because the function returns an integer but the type of contract indicates bool.
• Body
• Incorrect! The body of the function has been defined accurately. Option B is right because the function returns an integer but the type of contract indicates bool.

Q-9: At a pizzeria, adults order two slices, boys order three slices, and girls order one slice. Each pizza has eight slices. Write a function that takes three parameters representing the number of adults, boys, and girls, and returns the required number of pizzas. Which example is correct?

• >>> num_pizzas(1, 2, 3) 2
• Correct! The group will need atleast 11 slices. Since each pizza has 8 slices, the group would need atleast 2 pizzas.
• >>> num_pizzas(1, 2, 3) 1
• Incorrect! The group will need atleast 11 slices. Since each pizza has 8 slices, the group would need atleast 2 pizzas.
• >>> num_pizzas(1, 2, 3) 9
• Incorrect! The group will need atleast 11 slices. Since each pizza has 8 slices, the group would need atleast 2 pizzas.
• >>> num_pizzas(1, 2, 3) 6
• Incorrect! The group will need atleast 11 slices. Since each pizza has 8 slices, the group would need atleast 2 pizzas.

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