APCSP Unit 5 CodeHS

Question 1

What is the output of the following code?

def quadruple_number(x):
quad_x = 4 * x
print(quad_x)

x = 5
quadruple_number(x)

Answer 1

20

Question 2

Why do we write functions?

Answer 2

Make our code easier to understand by giving a readable name to a group of instructions
Avoid writing repeated code
Make our code reusable

Question 3

What is the parameter of the function quadruple_number?

def quadruple_number(x):
quad_x = 4 * x
print(quad_x)

Answer 3

x

Question 4

What is printed by the following code?

def print_numbers(first, second, third):
print(first)
print(second)
print(third)

middle = 5
print_numbers(4, middle, 6)

Answer 4

4
5
6

Question 5

What are the parameters of the print_numbers function?

def print_numbers(first, second, third):
print(first)
print(second)
print(third)

Answer 5

first, second, third

Question 6

If we want to draw a circle using our helpful draw_circle function at position (300, 400) with a radius of 40 and color blue, which is the correct function call?

As a reminder, here’s the function header for draw_circle:

def draw_circle(radius, color, x, y)

Answer 6

draw_circle(40, Color.blue, 300, 400)

Question 7

Do functions need to have parameters?

Answer 7

No, they don’t have to

Question 8

Which of the following functions successfully returns double the variable ‘number’?

def my_function(number):
return number*2

def my_function(number*2):
return

def my_function():
return number

def my_function(number):
number*2

Answer 8

def my_function(number):
return number*2

Question 9

Which of the following functions successfully returns the number 10?

def my_function():
10

def my_function(10):
return

def my_function():
return 10

def my_function():
print 10

Answer 9

def my_function():
return 10

Question 10

How many parameters go into the function sum?

def sum(first, second):
result = first + second
return result

Answer 10

2

Question 11

How many return values come out of the function sum?

def sum(first, second):
result = first + second
return result

Answer 11

1

Question 12

In which namespace is the variable ‘x’ defined in the following program?

x = 10

def add_nums():
y = 2
z = x + y
print z

Answer 12

Global namespace

Question 13

If added to the program below, which of the following additional functions would not cause an error?

x = 10

def add_nums():
y = 2
z = x + y
print z
_____________________
def subtract_nums():
z = x - y
print z

def subtract_nums():
z = z - x
print z

def subtract_nums():
y = 5
z = x - y
print z

def subtract_nums():
z = y
z = x - y
print

Answer 13

def subtract_nums():
y=5
z=x-y
print z

Question 14

Which keywords are relevant to exceptions in Python?

Answer 14

try and except

Question 15

What type of error occurs when a programing is expecting an integer value and the user enters a string?

Answer 15

ValueError

Question 16

What is the meaning of the x variable in the following code:

size = 20
x = 100
y = 200
ball = Circle(size)
circle.set_position(x, y)
_____________________
The x coordinate of the left side of a box that would hold the circle

The x coordinate of the right edge of the circle

The radius of the circle

The x position of the center circle

Answer 16

The x position of the center circle

Question 17

The following program should draw a circle on the screen. But when we run this code, we don’t see the circle. What is missing?

def draw_circle(x, y):
circle = Circle(100)
circle.set_position(x, y)

Answer 17

add(circle) command

Question 18

We want to position a Circle on our screen to be at a random position, but we want to keep the entire shape on the screen. Which of the following will accomplish this given the following function? (Assume SIZE, HEIGHT, and WIDTH are properly defined)

def draw_circle(x, y, radius):
circle = Circle(radius)
circle.set_position(x, y)
add(circle)

Answer 18

x =random.randint(SIZE,WIDTH-SIZE)
y =random.randint(SIZE,HEIGHT-SIZE)
draw_circle(x, y, SIZE)

Question 19

In the following function print_three_times:

def print_three_times(word):
print(word)
print(word)
print(word)
What is the parameter of the function?

Answer 19

word

Question 20

What is the output of the following program?

def sum_to(num):
sum = 0
for i in range(num+1):
sum += i
print(sum)

x = 5
sum_to(x)
print(x)

Answer 20

15
5

Question 21

What is printed by the following program?

def print_numbers(two, one, zero):
print(two)
print(one)
print(zero)

zero = 0
one = 1
two = 2
print_numbers(zero, one, two)

Answer 21

0
1
2

Question 22

How many parameters go into the function sum, and how many return values come out of the function sum?

def sum(first, second, third):
result = first + second + third
print(first)
print(second)
print(third)
return result

Answer 22

3 parameters come in, 1 return value comes out

Question 23

“It’s a bird! It’s a plane! No, it’s Superman!”
We want to write a function is_superman that takes in two parameters is_bird and is_plane and returns True if it is in fact Superman, and False otherwise.
If it’s not a bird and it’s not a plane, it must be Superman.
Which of the following functions is the correct implementation of is_superman?
_____________________
def is_superman(is_bird, is_plane):
return is_bird or is_plane

def is_superman(is_bird, is_plane):
return not is_bird or not is_plane

def is_superman(is_bird, is_plane):
return not is_bird and not is_plane

def is_superman(is_bird, is_plane):
return is_bird and is_plane

Answer 23

def is_superman(is_bird, is_plane):
return not is_bird and not is_plane

Question 24

What is printed by the following program?

def product(x, y):
return x * y

def difference(x, y):
return x - y

x = 2
y = 5
value1 = product(x, y)
value2 = difference(y, x)

result = difference(value1, value2)
print(result)

Answer 24

7

Question 25

Which variables exist at point A? In other words, which variables are in scope at point A? Which variables could you type at point A and the program would still work? In the following code:

import random

MAX_NUMBER = 10

def sum(x, y):
result = x + y

#Point A

return result

num1 = random.randint(0, MAX_NUMBER)
num2 = random.randint(0, MAX_NUMBER)
print(sum(num1, num2))

Answer 25

result, x, y, num1, num2, and MAX_NUMBER

Question 26

Which statement allows us to return values from functions?

Answer 26

return

Question 27

Which of the following is true for an API?

I. Allows different devices to connect with each other
II. Allows for Interactivity between devices and software
III. Messenger program that takes requests and delivers the response back to the user
IV. Allows the creation of applications that access the features or data of an operating system, application, or other services
V. Specifies how software components should interact
VI. Used when programming graphical user interface (GUI) components

Answer 27

all

Question 28

What does API stand for in computer science?

Answer 28

Application Program Interface

Question 29

What is the purpose of a return statement in a function?

Answer 29

stops executing the function and returns the value

Question 30

Which of the following is true about return values?

Functions can have return values, but they are optional.

Functions can have more than one return value

Functions must have a return value

Functions need to return the same number of values that were passed in to the function

Answer 30

Functions can have return values, but they are optional

Question 31

Consider the following code snippet. What is returned and printed for the value of a?

def mystery(x, y):
if x < y:
return x
else:
return y

a = mystery(10, 14)
b = mystery(82, 28)

print(a)
print(b)

Answer 31

10

Question 32

What does the mystery function do in the code snippet below?

def mystery(x, y):
if x < y:
return x
else:
return y

a = mystery(10, 14)
b = mystery(82, 28)

print(a)
print(b)

Answer 32

returns the smaller of two values passed to it

Question 33

Consider the following code snippet and what would the following print?
y = mystery2(12)
print(y)
___________________
def mystery1(x):
result = x + 1
return result

def mystery2(x, y):
result = x + y
return result

def mystery3(x):
result = x * x
return result

Answer 33

this would generate an error

Question 34

Which of the following functions will correctly return True if it is passed an odd integer value for x?

I.

def is_odd (x) :
return x % 2 == 1
II.

def is_odd (x) :
return x / 2 == 1
III.

def is_odd (x) :
if x % 2 == 1:
return True
else:
return False

Answer 34

I. and III.

Question 35

Consider the following code snippet. In the third call to draw_circle(), what values are passed to the coordinates of the center of the circle?

WIDTH = 300
HEIGHT = 300

def draw_circle(radius, color, x, y):
circle = Circle(radius)
circle.set_color(color)
circle.set_position(x, y)
add(circle)

draw_circle(40, “red” 100, 300)
draw_circle(50, “green”, 50, 100)
draw_circle(70, “blue”, WIDTH/2, HEIGHT/2)
draw_circle(25, “yellow”, WIDTH/2, 300)

Answer 35

150, 150

Question 36

What is the return value for this function?

def draw_circle(radius, color, x, y):
circle = Circle(radius)
circle.set_color(color)
circle.set_position(x, y)
add(circle)

Answer 36

this function has no return value

Question 37

Consider the code snippet:

def print_numbers(first, second, third):
print(first)
print(second)
print(third)

print_numbers(12, 17, 65)
print_numbers(1, 2, 3)
print_numbers(3, 3, 20)
What are names of the parameters?

Answer 37

first, second, third