Starting Out with Python 4e (Gaddis)
Chapter 5 Functions
TRUE/FALSE
1. Python function names follow the same rules as those for naming variables.
ANS: T
2. The function header marks the beginning of the function definition.
ANS: T
3. A function definition specifies what a function does and causes the function to execute.
ANS: F
4. A hierarchy chart shows all the steps that are taken inside a function.
ANS: F
5. A local variable can be accessed from anywhere in the program.
ANS: F
6. Different functions can have local variables with the same names.
ANS: T
7. Python allows you to pass multiple arguments to a function.
ANS: T
8. To assign a value to a global variable in a function, the global variable must be first declared in the function.
ANS: T
9. The value assigned to a global constant can be changed in the mainline logic.
ANS: F
10. One reason not to use global variables is that it makes a program hard to debug.
ANS: T
11. A value-returning function is like a simple function except that when it finishes it returns a value back to the part of the program that called it.
ANS: T
12. Unlike other languages, in Python the number of values a function can return is limited to one.
ANS: F
13. In Python you can have a list of variables on the left side of the argument operator.
ANS: T
14. In Python there is no restriction on the name of a module file.
ANS: F
15. One of the drawbacks of a modularized program is that the only structure you can use in such a program is the sequence structure.
ANS: F
16. One reason to store graphics functions in a module is so that you can import the module into any program that needs to use those functions.
ANS: T
17. The randrange function returns a randomly selected value from a specific sequence of numbers.
ANS: T
18. The math function atan(x) returns one tangent of x in radians.
ANS: F
19. The math function ceil(x) returns the smallest integer that is greater than or equal to x.
ANS: T
20. Unfortunately, there is no way to store and call on functions when using turtle graphics.
ANS: F
MULTIPLE CHOICE
1. What is a group of statements that exists within a program for the purpose of performing a specific task?
a.
a function
b.
a subtask
c.
a process
d.
a subprocess
ANS: A
2. The first line in a function definition is known as the function
a.
header
b.
block
c.
return
d.
parameter
ANS: A
3. The __________ design technique can be used to break down an algorithm into functions.
a.
subtask
b.
block
c.
top-down
d.
simplification
ANS: C
4. A set of statements that belong together as a group and contribute to the function definition is known as a
a.
header
b.
block
c.
return
d.
parameter
ANS: B
5. A(n) __________ chart is also known as a structured chart.
a.
flow
b.
data
c.
hierarchy
d.
organizational
ANS: C
6. A __________ variable is created inside a function.
a.
global
b.
constant
c.
named constant
d.
local
ANS: D
7. The __________ of a local variable is the function in which that variable is created.
a.
global reach
b.
definition
c.
space
d.
scope
ANS: D
8. A(n) __________ is any piece of data that is passed into a function when the function is called.
a.
global variable
b.
argument
c.
local variable
d.
parameter
ANS: B
9. A(n) __________ is a variable that receives an argument that is passed into a function.
a.
global variable
b.
argument
c.
named constant
d.
parameter
ANS: D
10. A __________ variable is accessible to all the functions in a program file.
a.
keyword
b.
local
c.
global
d.
string
ANS: C
11. A __________ constant is a name that references a value that cannot be changed while the program runs.
a.
keyword
b.
local
c.
global
d.
string
ANS: C
12. When a function is called by its name during the execution of a program, then it is
a.
executed
b.
located
c.
defined
d.
exported
ANS: A
13. It is recommended that programmers avoid using __________ variables in a program whenever possible.
a.
local
b.
global
c.
string
d.
keyword
ANS: B
14. The Python library functions that are built into the Python __________ can be used by simply calling the required function.
a.
code
b.
compiler
c.
linker
d.
interpreter
ANS: D
15. Python comes with __________ functions that have already been prewritten for the programmer.
a.
standard
b.
library
c.
custom
d.
key
ANS: A
16. What type of function can be used to determine whether a number is even or odd?
a.
even
b.
odd
c.
math
d.
Boolean
ANS: D
17. A value-returning function is
a.
a single statement that performs a specific task
b.
called when you want the function to stop
c.
a function that will return a value back to the part of the program that called it
d.
a function that receives a value when called
ANS: C
18. Which of the following statements causes the interpreter to load the contents of the random module into memory?
a.
load random
b.
import random
c.
upload random
d.
download random
ANS: B
19. Whic of the following will assign a random integer in the range of 1 through 50 to the variable number?
a.
random(1, 50) = number
b.
number = random.randint(1, 50)
c.
randint(1, 50) = number
d.
number = random(range(1, 50))
ANS: B
20. What does the following statement mean?
num1, num2 = get_num()
a.
The function get_num() is expected to return a value for num1 and for num2.
b.
The function get_num() is expected to return one value and assign it to num1 and num2.
c.
This statement will cause a syntax error.
d.
The function get_num() will receive the values stored in num1 and num2.
ANS: A
21. What will display after the following code is executed?
def main():
print(“The answer is”, magic(5))
def magic(num):
answer = num + 2 * 10
return answer
main()
a.
70
b.
25
c.
100
d.
The statement will cause a syntax error.
ANS: B
22. In a value-returning function, the value of the expression that follows the keyword __________ will be sent back to the part of the program that called the function.
a.
def
b.
result
c.
sent
d.
return
ANS: D
23. The Python standard library’s __________ module contains numerous functions that can be used in mathematical calculations.
a.
math
b.
string
c.
random
d.
number
ANS: A
24. Which of the following functions returns the largest integer that is less than or equal to its argument?
a.
floor
b.
ceil
c.
lesser
d.
greater
ANS: A
25. What will be the output after the following code is executed?
def pass_it(x, y):
z = x + “, ” + y
return(z)
name2 = “Tony”
name1 = “Gaddis”
fullname = pass_it(name1, name2)
print(fullname)
a.
Tony Gaddis
b.
Gaddis Tony
c.
Tony, Gaddis
d.
Gaddis, Tony
ANS: D
26. What will be the output after the following code is executed?
def pass_it(x, y):
z = x , “, ” , y
num1 = 4
num2 = 8
answer = pass_it(num1, num2)
print(answer)
a.
4, 8
b.
8, 4
c.
48
d.
None
ANS: D
27. What will be the output after the following code is executed?
def pass_it(x, y):
z = y**x
return(z)
num1 = 3
num2 = 4
answer = pass_it(num1, num2)
print(answer)
a.
81
b.
64
c.
12
d.
None
ANS: B
28. What will be displayed after the following code is executed?
def pass_it(x, y):
z = x*y
result = get_result(z)
return(result)
def get_result(number):
z = number + 2
return(z)
num1 = 3
num2 = 4
answer = pass_it(num1, num2)
print(answer)
a.
12
b.
9
c.
14
d.
Nothing, this code contains a syntax error.
ANS: C
29. What does the following program do?
import turtle
def main():
turtle.hideturtle()
square(100,0,50,’blue’)
def square(x, y, width, color):
turtle.penup()
turtle.goto(x, y)
turtle.fillcolor(color)
turtle.pendown()
turtle.begin_fill()
for count in range(4):
turtle.forward(width)
turtle.left(90)
turtle.end_fill()
main()
a.
It draws a blue square at coordinates (100, 0), 50 pixels wide, starting at the top right corner.
b.
It draws a blue square at coordinates (0, 50), 100 pixels wide, starting at the top right corner.
c.
It draws a blue square at coordinates (100, 0), 50 pixels wide, in the lower-left corner.
d.
Nothing since you cannot call a function with turtle graphics.
ANS: C
30. What does the following program do?
import turtle
def main():
turtle.hideturtle()
square(100,0,50,’blue’)
def square(x, y, width, color):
turtle.penup()
turtle.goto(x, y)
turtle.fillcolor(color)
turtle.pendown()
turtle.begin_fill()
for count in range(2):
turtle.forward(width)
turtle.left(90)
turtle.end_fill()
main()
a.
It draws a blue square.
b.
It draws a blue triangle.
c.
It draws 2 blue lines.
d.
Nothing since you cannot call a function with turtle graphics.
ANS: B
COMPLETION
1. The code for a function is known as a function ___________.
ANS: definition
2. The function header begins with the keyword __________ and is followed by the name of the function.
ANS: def
3. The main function contains a program’s __________ logic which is the overall logic of the program.
ANS: mainline
4. In a flowchart, a function call is depicted by a(n) ___________.
ANS: rectangle
5. The top-down design breaks down the overall task of a program into a series of __________.
ANS: subtasks
6. A(n) __________ chart is a visual representation of the relationships between functions.
ANS: hierarchy
7. Arguments are passed by __________ to the corresponding parameter variables in a function.
ANS: position
8. A variable is available only to statements in the variable’s __________.
ANS: scope
9. Functions that are in the standard library are stored in files that are known as __________.
ANS: modules
10. To refer to a function in a module, Python uses ___________ notation.
ANS: dot
11. A value-returning function has a(n) ___________ statement that sends a value back to the part of the program that called it.
ANS: return
12. The ___________ chart is an effective tool used by programmers to design and document functions.
ANS: IPO
13. The ‘P’ in the acronym IPO refers to ___________.
ANS: processing
14. In Python, a module’s file name should end in ___________.
ANS: .py
15. The approach known as __________ makes a program easier to understand, test, and maintain.
ANS: modularization
16. The return values of the trigonometric functions in Python are in __________.
ANS: radians